Collection of Data

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CBSE Learning Objectives – Key Concepts & Skills You Must Know

Learning Objectives

Understand the meaning and purpose of data collection.
Distinguish between primary and secondary sources of data.
Know the modes of data collection.
Differentiate between Census and Sample Surveys.
Familiarize with techniques of sampling.
Identify important sources of secondary data.

CBSE Revision Notes & Quick Summary for Last-Minute Study

Collection of Data

Introduction

Purpose of data collection: To show evidence for reaching a sound and clear solution to a problem.
Example: Fluctuations in food grain production over the years.

Types of Data

Primary Data: Based on first-hand information.
Secondary Data: Collected from existing sources.

Modes of Data Collection

Personal Interviews:
- Face-to-face interaction.
- Advantages: Clarification of questions, personal contact.
- Disadvantages: Expensive, time-consuming.
Mailing Questionnaires:
- Sent to individuals with a request to complete and return.
- Advantages: Less expensive, access to remote areas.
- Disadvantages: Low response rates, potential misunderstanding.
Telephone Interviews:
- Conducted over the phone.
- Advantages: Cheaper, quicker, allows clarification.
- Disadvantages: Limited access, potential for influencing responses.

Sampling Techniques

Census: Complete enumeration of the population.
Sample Surveys: A smaller group selected from the population.
- Random Sampling: Every individual has an equal chance of selection.
- Non-Random Sampling: Selection based on judgment or convenience.

Errors in Data Collection

Sampling Errors: Differences between sample estimates and population parameters.
Non-Sampling Errors: Arise from data acquisition issues, non-response, or bias.

Important Agencies for Data Collection

Census of India
National Sample Survey (NSS)
Central Statistics Office (CSO)

Conclusion

Data collection is essential for understanding and analyzing economic issues. The choice of data source and collection method depends on the study's objectives.

CBSE Exam Tips, Important Questions & Common Mistakes to Avoid

Common Mistakes and Exam Tips

Common Pitfalls

Misunderstanding Sampling Methods: Students often confuse random sampling with non-random sampling. Ensure you understand that in random sampling, every individual has an equal chance of being selected, while non-random sampling involves bias in selection.
Ignoring Non-Sampling Errors: Many overlook the significance of non-sampling errors, which can be more serious than sampling errors. Be aware of issues like non-response errors and data acquisition errors.
Leading Questions in Surveys: When designing questionnaires, avoid leading questions that suggest a particular answer. For example, instead of asking, "Don't you think smoking should be prohibited?" ask, "Do you think smoking should be prohibited?"
Ambiguous Questions: Questions should be clear and precise. Ambiguous questions can confuse respondents and lead to inaccurate data collection.

Tips for Success

Understand Data Collection Methods: Familiarize yourself with different data collection methods such as personal interviews, mailing surveys, and telephone interviews. Know their advantages and disadvantages.
Practice Designing Questionnaires: Create sample questionnaires to practice structuring questions effectively. Ensure they are easy to understand and avoid complex wording.
Review Sampling Techniques: Make sure you can differentiate between census and sample surveys, and understand when to use each method.
Clarify Definitions: Be clear on definitions such as population, sample, sampling error, and non-sampling error. This clarity will help in answering exam questions accurately.

CBSE Quiz & Practice Test – MCQs, True/False Questions with Solutions

Multiple Choice Questions

They allow for clarification of questions.

They are the least expensive method.

They are time-consuming and expensive.

They provide the lowest response rate.

Correct Answer: C

Solution:

Personal interviews are time-consuming and expensive as they require trained interviewers and longer time to complete the survey.

National Sample Survey (NSS)

Central Statistics Office (CSO)

Registrar General of India (RGI)

Labour Bureau

Correct Answer: C

Solution:

The Registrar General of India is responsible for conducting the Census of India.

Personal Interviews

Mailing Questionnaire

Telephone Interviews

Online Surveys

Correct Answer: B

Solution:

Mailing questionnaires can reach respondents in remote areas where personal or telephone interviews might not be feasible.

Personal Interviews

Mailing Surveys

Telephone Interviews

Online Surveys

Correct Answer: A

Solution:

Personal interviews involve face-to-face interaction, allowing the interviewer to explain the study and answer any queries.

The use of convenience sampling

The use of a non-random sampling method

The use of random number tables or computer programs

The selection of samples based on judgment

Correct Answer: C

Solution:

Random sampling ensures every individual has an equal chance of being selected by using random number tables or computer programs.

Sampling bias

Difference between sample estimate and population parameter

Random selection of samples

Increase in sample size reduces error

Correct Answer: A

Solution:

Non-sampling errors include sampling bias, which occurs when the sampling plan excludes certain members of the target population.

It is less time-consuming and less expensive.

It provides more detailed information.

It eliminates all types of errors.

It covers the entire population.

Correct Answer: A

Solution:

Sample surveys are typically less time-consuming and less expensive than a census because they involve collecting data from a smaller subset of the population.

Census of India

National Sample Survey

Personal Interviews

Central Statistics Office

Correct Answer: C

Solution:

Primary data is collected directly from the source through methods like personal interviews.

To finalize the sample size.

To identify and rectify any shortcomings in the questionnaire.

To collect the final data for analysis.

To ensure all questions are multiple-choice.

Correct Answer: B

Solution:

Pre-testing the questionnaire in a pilot survey helps identify and rectify any shortcomings, ensuring clarity and effectiveness before the actual survey.

Every individual has an equal chance of being selected.

Selection is based on convenience or judgment.

It is also known as the lottery method.

It is always free from bias.

Correct Answer: B

Solution:

Non-random sampling involves selecting samples based on convenience or judgment, rather than giving each individual an equal chance of being selected.

High cost

Limited reach to remote areas

Low response rates

Influence on respondents

Correct Answer: C

Solution:

Mailing questionnaires often result in low response rates due to factors like non-return of questionnaires or loss in mail.

To estimate the average income of a region

To collect data from a sample of the population

To collect demographic data from the entire population

To conduct surveys on socio-economic issues

Correct Answer: C

Solution:

A Census involves collecting data from every individual in the population to gather comprehensive demographic information.

They can be minimized by increasing the sample size.

They are less serious than sampling errors.

They include errors in data acquisition.

They do not occur in Census data.

Correct Answer: C

Solution:

Non-sampling errors include errors in data acquisition, such as recording incorrect responses, and are not minimized by increasing sample size.

Every individual has an equal chance of being selected.

Selection is based on convenience.

It is more expensive than a Census.

It always provides accurate results.

Correct Answer: A

Solution:

In random sampling, every individual in the population has an equal chance of being selected, ensuring a representative sample.

To finalize the research hypothesis.

To pre-test the questionnaire and identify potential issues.

To collect the final data for analysis.

To reduce the sample size.

Correct Answer: B

Solution:

A pilot survey is conducted to pre-test the questionnaire and identify any shortcomings or issues before the main survey.

Sampling error

Non-sampling error

Data acquisition error

Non-response error

Correct Answer: A

Solution:

Sampling error can be minimized by taking a larger sample, whereas non-sampling errors are not easily reduced by increasing sample size.

It includes every element of the population.

It is less expensive than sample surveys.

It is conducted randomly.

It is always more accurate than sample surveys.

Correct Answer: A

Solution:

A Census survey includes every element of the population, providing complete data.

Sampling Bias

Non-Response Error

Data Acquisition Error

Measurement Error

Correct Answer: B

Solution:

Non-response error occurs when a person listed in the sample cannot be contacted or refuses to respond, leading to potential bias.

All units of the population have an equal chance of being selected

Selection is based on the researcher's judgment

Samples are selected based on convenience

Samples are selected based on quota

Correct Answer: A

Solution:

In random sampling, every individual or unit has an equal chance of being selected, which helps to reduce bias and ensure the representativeness of the sample.

High cost

Low response rate

Influence of interviewer

Limited geographical reach

Correct Answer: B

Solution:

Mail surveys often suffer from low response rates due to non-return of questionnaires or incomplete responses.

It provides more detailed information at a lower cost.

It eliminates all forms of data collection errors.

It ensures that every individual in the population is surveyed.

It guarantees a higher accuracy than a census.

Correct Answer: A

Solution:

A sample survey is generally smaller than the population and is capable of providing reasonably accurate information about the population at a much lower cost and shorter time.

Data collected through personal interviews

Data obtained from published reports

Data sourced from government publications

Data extracted from online databases

Correct Answer: A

Solution:

Primary data is collected first-hand by the researcher through methods such as personal interviews, surveys, or experiments. The other options represent secondary data sources.

Sample surveys are less expensive and time-consuming.

Census data is always outdated.

Sample surveys are more accurate than censuses.

Census data is not available for agricultural studies.

Correct Answer: A

Solution:

Sample surveys are preferred because they provide reasonably reliable and accurate information at a lower cost and in a shorter time compared to a census.

Personal Interviews

Mailing Questionnaires

Telephone Interviews

Using Census Data

Correct Answer: D

Solution:

Census data is considered secondary data as it is collected by a governmental agency and not directly by the researcher.

Lottery method

Convenience sampling

Random number table

Exit polls

Correct Answer: B

Solution:

Convenience sampling is a non-random method where samples are selected based on ease of access.

Sampling bias

Non-response error

Error in data acquisition

All of the above

Correct Answer: D

Solution:

Non-sampling errors include sampling bias, non-response errors, and errors in data acquisition, which can occur regardless of sample size.

It is conducted every five years.

It only collects data on employment rates.

It provides a complete demographic record of the population.

It is conducted by the National Sample Survey Office (NSSO).

Correct Answer: C

Solution:

The Census of India provides a comprehensive demographic record of the population, including various aspects such as size, density, sex ratio, and literacy.

Data collected through a national census

Data obtained from a published research paper

Data gathered from a government statistical report

Data retrieved from an online database

Correct Answer: A

Solution:

Primary data is based on firsthand information, such as data collected directly through a national census.

To collect data from the entire population

To pre-test the questionnaire and identify issues

To finalize the sample size

To conduct the final survey

Correct Answer: B

Solution:

A pilot survey is conducted to pre-test the questionnaire, identify any issues, and make necessary adjustments before the final survey.

To understand and analyze economic problems

To increase the literacy rate

To predict weather patterns

To improve agricultural techniques

Correct Answer: A

Solution:

The main purpose of collecting data in economics is to understand, explain, and analyze economic problems and the causes behind them.

Sampling bias

Non-response errors

Errors in data acquisition

Random selection of samples

Correct Answer: D

Solution:

Random selection of samples is a characteristic of random sampling and does not contribute to non-sampling errors.

It is always larger than the population

It provides accurate information at a lower cost

It includes every individual in the population

It is selected based on convenience

Correct Answer: B

Solution:

A good sample is smaller than the population and provides reasonably accurate information at a lower cost and shorter time.

All farms in Punjab

A random selection of farms across different districts in Punjab

Farms in one district of Punjab

Farms owned by a single agricultural company

Correct Answer: B

Solution:

A random selection of farms across different districts will provide a representative sample of the entire region.

It is more expensive than personal interviews.

It limits the ability to clarify questions for respondents.

It may not reach individuals without access to a telephone.

It allows for observation of respondents' reactions.

Correct Answer: C

Solution:

A significant disadvantage of telephone interviews is that they may not reach individuals who do not have access to a telephone.

Personal Interviews

Mailing Questionnaire

Telephone Interviews

Online Surveys

Correct Answer: A

Solution:

Personal interviews involve face-to-face interaction between the interviewer and the respondent, allowing for clarification and detailed responses.

Sampling error

Non-response error

Data acquisition error

Sampling bias

Correct Answer: A

Solution:

Sampling error, which is the difference between the sample estimate and the population parameter, can be reduced by increasing the sample size. Non-sampling errors like non-response or data acquisition errors are not reduced by larger samples.

Personal Interviews

Mailing Questionnaire

Telephone Interviews

Exit Polls

Correct Answer: B

Solution:

Mailing questionnaires often result in low response rates due to non-return or loss of the questionnaire.

Every individual has an equal chance of being selected.

It involves personal judgment in selecting samples.

It helps in reducing bias in sample selection.

It is often used in exit polls.

Correct Answer: B

Solution:

Random sampling does not involve personal judgment; it ensures every individual has an equal chance of being selected.

Census of India

National Sample Survey (NSS)

Central Statistics Office (CSO)

Labour Bureau

Correct Answer: B

Solution:

The National Sample Survey (NSS) conducts nationwide surveys on socio-economic issues.

Every individual has an equal chance of being selected

It is based on the researcher's judgment

It is more expensive than non-random sampling

It always provides accurate results

Correct Answer: A

Solution:

In random sampling, every individual in the population has an equal chance of being selected, which helps in reducing bias.

Telephone Interviews

Mailing Questionnaire

Personal Interviews

Online Surveys

Correct Answer: C

Solution:

Personal interviews involve direct interaction between the researcher and the respondent, allowing for clarification and expansion of responses.

Random sampling using a lottery method.

Convenience sampling by selecting easily accessible individuals.

Systematic sampling with a fixed interval.

Stratified sampling based on demographic characteristics.

Correct Answer: B

Solution:

Convenience sampling can introduce sampling bias because it relies on selecting individuals who are easily accessible, which may not represent the entire population.

It is smaller than the population.

It provides accurate information about the population.

It includes every individual in the population.

It is selected randomly.

Correct Answer: C

Solution:

A good sample is smaller than the population and is capable of providing accurate information. It does not include every individual, which would make it a census.

Sampling error

Non-response error

Data acquisition error

Measurement error

Correct Answer: B

Solution:

Non-response error occurs when selected respondents do not provide information, leading to potential bias in the survey results.

Increasing the sample size.

Conducting a pilot survey.

Using leading questions.

Selecting samples based on convenience.

Correct Answer: A

Solution:

Sampling errors can be minimized by increasing the sample size, which provides a more accurate estimate of the population parameter.

It provides less accurate data.

It requires a smaller team of enumerators.

It is more time-consuming and expensive.

It does not cover every individual in the population.

Correct Answer: C

Solution:

A Census survey is more time-consuming and expensive because it involves collecting data from every individual in the population.

It allows for the selection of samples based on convenience.

It ensures every individual has an equal chance of being selected.

It is less expensive than other methods.

It guarantees a higher response rate.

Correct Answer: B

Solution:

Random sampling ensures that every individual in the population has an equal chance of being selected, which helps in obtaining a representative sample.

To reduce the cost of the main survey

To test the clarity and effectiveness of the questionnaire

To gather data for final analysis

To increase the sample size

Correct Answer: B

Solution:

A pilot survey is conducted to pre-test the questionnaire, identify any issues, and ensure that the questions are clear and effective before the main survey is conducted.

It covers the entire population.

It is less expensive and time-consuming.

It provides more detailed information.

It eliminates all types of errors.

Correct Answer: B

Solution:

Sample surveys are preferred because they are less expensive and time-consuming compared to a census.

Personal interviews

Mailing questionnaires

Telephone interviews

Online surveys

Correct Answer: D

Solution:

Online surveys are cost-effective and can reach a large and geographically dispersed population quickly, unlike personal interviews or telephone interviews which may be limited by geographical constraints.

Personal interviews

Mailing questionnaires

Telephone interviews

Online surveys

Correct Answer: B

Solution:

Mailing questionnaires is suitable for reaching individuals in remote areas where personal interviews and telephone interviews may not be feasible.

Selecting a smaller sample size.

Recording incorrect responses due to transcription errors.

Using random sampling methods.

Calculating the sample mean incorrectly.

Correct Answer: B

Solution:

Non-sampling errors include errors in data acquisition, such as recording incorrect responses due to transcription errors.

It includes every element of the population.

It is larger than the population.

It accurately reflects the characteristics of the population.

It is always selected using non-random methods.

Correct Answer: C

Solution:

A representative sample accurately reflects the characteristics of the population, allowing for reliable inferences.

It is less expensive

It ensures every individual has an equal chance of being selected

It requires fewer enumerators

It provides more detailed information

Correct Answer: B

Solution:

Random sampling ensures that every individual in the population has an equal chance of being selected, which helps in obtaining a representative sample.

High cost

Inability to reach remote areas

Low response rate

Influence on respondents

Correct Answer: C

Solution:

Mailing surveys often suffer from low response rates due to factors like non-return of questionnaires.

It includes every element of the population.

It is a type of non-random sampling.

It only surveys a small group of people.

It is conducted every five years.

Correct Answer: A

Solution:

A Census includes every element of the population, providing complete data.

An error due to incorrect data recording

An error due to the difference between sample estimate and population parameter

An error caused by non-response

An error due to biased question framing

Correct Answer: B

Solution:

A sampling error is the difference between the sample estimate and the actual value of the population parameter.

National Sample Survey (NSS)

Central Statistics Office (CSO)

Registrar General of India (RGI)

Labour Bureau

Correct Answer: C

Solution:

The Registrar General of India (RGI) is responsible for conducting the Census of India, which provides comprehensive demographic data.

It provides more detailed information.

It is less expensive and time-consuming.

It eliminates all types of errors.

It ensures complete accuracy.

Correct Answer: B

Solution:

A sample survey is generally less expensive and time-consuming than a census because it involves collecting data from a smaller group rather than the entire population.

They are less expensive.

They can be conducted quickly.

They may influence respondents.

They provide no opportunity for clarification.

Correct Answer: C

Solution:

Personal interviews may influence respondents due to the presence of the interviewer.

It is more costly.

It requires more time.

It introduces bias in selection.

It requires a larger sample size.

Correct Answer: C

Solution:

Non-random sampling introduces bias as not all units have an equal chance of being selected.

Census of India

National Sample Survey (NSS)

Central Statistics Office (CSO)

Registrar General of India (RGI)

Correct Answer: B

Solution:

The National Sample Survey (NSS) conducts nationwide surveys on socio-economic issues in India.

Error due to the difference between sample estimate and population parameter

Error that occurs when some members of the target population cannot be included in the sample

Error that arises from incorrect recording of responses

Error minimized by taking a larger sample

Correct Answer: C

Solution:

Non-sampling errors include errors in data acquisition, such as incorrect recording of responses.

It provides more detailed information than a census.

It is less expensive and time-consuming than a census.

It eliminates all types of errors.

It requires more enumerators than a census.

Correct Answer: B

Solution:

A sample survey is often chosen over a census because it is less expensive and requires less time to conduct, while still providing reasonably accurate estimates.

True or False

Correct Answer: False

Solution:

While increasing the sample size can reduce sampling errors, it cannot completely eliminate them.

Correct Answer: True

Solution:

The Census of India is conducted every ten years, as stated in the excerpts.

Correct Answer: False

Solution:

While sample surveys can provide reasonably reliable and accurate information, a census covers every individual and provides the most complete data.

Correct Answer: True

Solution:

Random sampling ensures that every individual in the population has an equal chance of being selected.

Correct Answer: True

Solution:

Data collection aims to show evidence for reaching a sound and clear solution to a problem, as mentioned in the excerpts.

Correct Answer: True

Solution:

The Census of India is indeed conducted every ten years, providing comprehensive demographic data.

Correct Answer: True

Solution:

Sample surveys are preferred because they provide reliable information at a lower cost and in a shorter time.

Correct Answer: False

Solution:

In non-random sampling, not all units have an equal chance of being selected; selection is based on judgment, convenience, or quota.

Correct Answer: True

Solution:

Random sampling ensures that every individual has an equal chance of being selected.

Correct Answer: True

Solution:

Data collection aims to provide evidence for reaching a sound and clear solution to a problem.

Correct Answer: True

Solution:

The Census of India has been conducted every ten years since 1881, collecting comprehensive demographic data.

Correct Answer: False

Solution:

Primary data is collected firsthand through surveys and direct observations, not from secondary sources.

Correct Answer: False

Solution:

Exit polls do not always predict election results accurately, as mentioned in the excerpts.

Correct Answer: False

Solution:

Personal interviews are often the most expensive method of data collection due to the need for trained interviewers and the time required.

Correct Answer: False

Solution:

Primary data is collected directly from first-hand sources, not from secondary sources.

Correct Answer: True

Solution:

Sample surveys are preferred because they provide reliable information at a lower cost and shorter time than a census.

Correct Answer: False

Solution:

Non-sampling errors cannot be minimized by increasing the sample size. They arise from issues like data acquisition errors and non-response.

Correct Answer: False

Solution:

Exit polls are not always accurate in predicting election results due to sampling errors and other biases.

Correct Answer: False

Solution:

The Census of India is conducted every ten years, not five.

Correct Answer: True

Solution:

Primary data is obtained directly from the source through methods like surveys, interviews, and experiments.

Correct Answer: False

Solution:

Non-sampling errors cannot be completely eliminated by taking a larger sample. They can occur due to various factors like data acquisition errors or non-response.

Correct Answer: True

Solution:

Mailing questionnaires can effectively reach respondents in remote areas where personal or telephone interviews may not be feasible.

Correct Answer: False

Solution:

Mailing questionnaires is less expensive compared to personal interviews, as it allows access to remote areas and does not involve direct interaction.

Correct Answer: False

Solution:

Personal interviews are expensive as they require trained interviewers and take longer to complete.

Correct Answer: True

Solution:

The NSS conducts nationwide surveys in successive rounds to provide data on literacy, employment, and other socio-economic factors.

Correct Answer: False

Solution:

Non-sampling errors are difficult to minimize even by taking a large sample.

Correct Answer: True

Solution:

Sample surveys are preferred because they provide reliable information at a lower cost and in a shorter time compared to a census.

Correct Answer: True

Solution:

The Census of India is indeed conducted every ten years and collects comprehensive demographic data.

Correct Answer: False

Solution:

Mail surveys are generally less expensive compared to personal interviews.

Correct Answer: True

Solution:

A pilot survey helps in pre-testing the questionnaire to identify any shortcomings before the main survey.

Correct Answer: False

Solution:

Non-sampling errors are not reduced by increasing the sample size and can occur due to bias, data acquisition errors, and non-response.

Correct Answer: True

Solution:

In random sampling, each member of the population has an equal probability of being included in the sample.

Correct Answer: True

Solution:

The NSS conducts nation-wide surveys on socio-economic issues in continuous successive rounds.

Correct Answer: True

Solution:

In random sampling, every individual in the population has an equal chance of being selected, ensuring unbiased representation.

Correct Answer: False

Solution:

In non-random sampling, not all units have an equal chance of being selected, as selection is based on judgment, purpose, or convenience.

Correct Answer: True

Solution:

A pilot survey helps in pre-testing the questionnaire to identify any issues before the main survey.

Collection of Data

AI Learning Assistant

CBSE Learning Objectives – Key Concepts & Skills You Must Know

Learning Objectives

CBSE Revision Notes & Quick Summary for Last-Minute Study

Collection of Data

Introduction

Types of Data

Modes of Data Collection

Sampling Techniques

Errors in Data Collection

Important Agencies for Data Collection

Conclusion

CBSE Exam Tips, Important Questions & Common Mistakes to Avoid

Common Mistakes and Exam Tips

Common Pitfalls

Tips for Success

Multiple Choice Questions

Q1.Which of the following is a significant disadvantage of using personal interviews for data collection?

Correct Answer: C

Q2.Which agency is responsible for conducting the Census of India?

Correct Answer: C

Q3.Which data collection method is most suitable for reaching respondents in remote areas?

Correct Answer: B

Q4.Which of the following is a method of data collection that involves face-to-face interaction?

Correct Answer: A

Q5.In a random sampling method, what ensures that every individual has an equal chance of being selected?

Correct Answer: C

Q6.Which of the following is an example of a non-sampling error?

Correct Answer: A

Q7.In the context of data collection, which of the following is a primary advantage of using a sample survey over a census?

Correct Answer: A

Q8.Which of the following is a primary source of data collection?

Correct Answer: C

Q9.In a pilot survey, what is the primary purpose of pre-testing the questionnaire?

Correct Answer: B

Q10.Which of the following is a characteristic of a non-random sampling method?

Correct Answer: B

Q11.Which of the following is a disadvantage of using mailing questionnaires for data collection?

Correct Answer: C

Q12.What is the main purpose of conducting a Census?

Correct Answer: C

Q13.Which of the following is true about non-sampling errors?

Correct Answer: C

Q14.Which of the following is a characteristic of random sampling?

Correct Answer: A

Q15.In the context of data collection, what is the main purpose of conducting a pilot survey?

Correct Answer: B

Q16.Which of the following errors can be minimized by increasing the sample size?

Correct Answer: A

Q17.Which of the following is a characteristic of a Census survey?

Correct Answer: A

Q18.What is a non-sampling error that occurs when an interviewer cannot contact a person listed in the sample?

Correct Answer: B

Q19.Which of the following is a characteristic of a random sampling method?

Correct Answer: A

Q20.Which of the following is a major disadvantage of using mail surveys for data collection?

Correct Answer: B

Q21.In a study of agricultural laborers' economic conditions in a district, a researcher decides to use a sample survey instead of a census. Which of the following is a primary advantage of using a sample survey in this context?

Correct Answer: A

Q22.In the context of data collection, which of the following is a primary source of data?

Correct Answer: A

Q23.In a study to determine the average yield of wheat in Punjab, a researcher decides to use a sample survey instead of a census. Which of the following is a primary reason for this choice?

Correct Answer: A

Q24.Which of the following methods is NOT a way to collect primary data?

Correct Answer: D

Q25.Which of the following is a non-random sampling method?

Correct Answer: B

Q26.Which of the following is a non-sampling error?

Correct Answer: D

Q27.Which of the following statements about the Census of India is true?

Correct Answer: C

Q28.Which of the following is a primary source of data?

Correct Answer: A

Q29.What is the purpose of conducting a pilot survey?

Correct Answer: B

Q30.What is the main purpose of collecting data in economics?

Correct Answer: A

Q31.Which of the following is NOT a source of non-sampling error?

Correct Answer: D