Class 11 Economics - KERALA
Collection of Data
The chapter 'Collection of Data' in Class 11 Economics introduces students to the foundational steps of statistical analysis. It covers the two main sources of data: primary data, which is collected firsthand by the investigator, and secondary data, which is obtained from already published or unpublished sources. Students learn various methods of data collection, such as personal interviews, mailing questionnaires, and telephonic interviews, along with essential tools like questionnaires and schedules. Understanding census and sample surveys, along with sampling errors, is crucial for board exams as it forms the basis of practical statistical work in economics.
Start Learning FreeKey Concepts
Primary Data
Data collected for the first time by the investigator for a specific purpose, making it original in character.
Secondary Data
Data that has already been collected, processed, and published or used by someone else previously.
Census Survey
A method of enquiry where data is collected from every single unit of the entire population or universe under study.
Sample Survey
A method where data is collected from a small representative part (sample) of the entire population to draw conclusions about the whole group.
Pilot Survey
A small-scale preliminary test conducted before the actual survey to check the suitability and flaws of the questionnaire.
Important Formulas
Board Exam Info
In the Kerala (SCERT) Class 11 Economics board examinations, this chapter typically carries around 6 to 8 marks. Questions frequently include short notes distinguishing primary and secondary data, merits and demerits of sampling vs. census methods, and preparation of a good questionnaire.
Frequently Asked Questions
What is the difference between primary data and secondary data?
Primary data is collected firsthand by the investigator for a specific study, while secondary data is already collected and published by someone else for a different purpose.
Why is a pilot survey necessary?
A pilot survey helps identify shortcomings, ambiguous questions, and practical difficulties in the questionnaire before conducting the main large-scale survey.
When is the census method preferred over the sampling method?
The census method is preferred when the population size is small, units have diverse characteristics, and a high degree of accuracy and intensive examination is required.
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