Class 11 Economics - TELANGANA
Collection of Data
The chapter 'Collection of Data' in Class 11 Economics introduces students to the fundamental processes of gathering statistical information. It covers the difference between primary data (collected firsthand) and secondary data (already published or collected by others). Students will learn various methods of data collection such as personal interviews, mailing questionnaires, and telephonic interviews, along with the essential sources of secondary data like government publications and newspapers. Furthermore, the chapter discusses important concepts like sampling techniques, census vs. sample surveys, and the precautions needed to avoid errors, which are crucial for board exam problem-solving and conceptual questions.
Start Learning FreeKey Concepts
Primary Data
Data collected for the first time by the investigator himself for a specific research purpose, making it original in character.
Secondary Data
Data that has already been collected, processed, and published by someone else for some other purpose, such as census reports or RBI bulletins.
Census Method
A method of statistical enquiry where data is collected from every single unit of the entire population or universe.
Sample Survey
A method where data is collected from only a representative part (sample) of the population to draw inferences about the whole group.
Pilot Survey
A small-scale preliminary trial of the survey conducted before the main investigation to test the questionnaire and remove loopholes.
Important Formulas
Board Exam Info
In the Telangana (TSBSE) Class 11 Economics board exams, this chapter generally carries around 6 to 8 marks. Questions usually include short-answer questions differentiating between primary and secondary data, advantages and disadvantages of census versus sample surveys, and descriptive questions on the qualities of a good questionnaire.
Frequently Asked Questions
What is the main difference between primary and secondary data?
Primary data is original and collected firsthand by the investigator for a specific study, whereas secondary data is already collected and published by someone else for a different purpose.
When should we prefer the sample method over the census method?
The sample method is preferred when the population size is very large, when the units of study are homogeneous, and when there are severe constraints on time, money, and labor.
What are the essential qualities of a good questionnaire?
A good questionnaire should have a limited number of questions, simple and clear language, logical sequence of questions, avoid personal or sensitive queries, and contain multiple-choice or closed-ended questions where possible.
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