Class 11 Economics - TAMILNADU
Collection of Data
The chapter 'Collection of Data' in Class 11 Economics introduces students to the foundational steps of statistical enquiry. It explains the primary and secondary sources of data collection, detailing various methods such as direct personal investigation, oral interviews, questionnaires, and the use of published and unpublished secondary sources. Students will also learn about sampling techniques, including random and non-random sampling, and the essential qualities of a good questionnaire. This chapter is vital for board exams as it forms the basis of practical economic analysis, frequently appearing in objective, short-answer, and essay questions.
Start Learning FreeKey Concepts
Primary Data
Data collected for the first time by the investigator directly from the field of enquiry, making it original and specific to the research problem.
Secondary Data
Data that has already been collected, processed, and published by someone else for some other purpose, such as government reports or journals.
Census Method
A method of statistical enquiry where data is collected from every single unit of the entire population or universe under study.
Sampling Method
A method where data is collected from a representative small portion (sample) of the population to draw inferences about the entire population.
Questionnaire
A structured list of carefully framed questions sent or administered to informants to gather specific statistical information.
Important Formulas
Board Exam Info
In the Tamil Nadu (Samacheer Kalvi) Class 11 Economics board exam, this chapter typically carries around 6 to 10 marks. Questions usually include 1-mark objective questions, 2-mark definitions (like primary vs secondary data), 3-mark short notes on sampling methods or questionnaire qualities, and occasional 5-mark descriptive questions explaining methods of data collection.
Frequently Asked Questions
What is the difference between primary and secondary data?
Primary data is collected firsthand by the investigator for a specific study, whereas secondary data is pre-existing data collected earlier by someone else for another purpose.
Why is the sampling method preferred over the census method?
The sampling method is generally preferred because it saves time, requires less money, involves less labor, and is more practical when the population size is infinitely large.
What are the essential qualities of a good questionnaire?
A good questionnaire should have a limited number of questions, simple and clear language, logical sequencing of questions, and should avoid personal or sensitive questions.
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