Class 11 Economics - CBSE
Collection of Data
The chapter 'Collection of Data' in Class 11 Economics introduces students to the foundational steps of statistical enquiry. It covers the two main sources of data: primary data (collected firsthand) and secondary data (obtained from published or unpublished sources). Students will learn various methods of data collection such as personal interviews, mailing questionnaires, and telephonic interviews, along with essential sampling techniques like random and non-random sampling. Understanding this chapter is crucial for board exams as it forms the basis of practical statistical analysis and frequently features in both conceptual and application-based questions.
Start Learning FreeKey Concepts
Primary Data
Data collected for the first time by the investigator himself for a specific purpose, making it original in character.
Secondary Data
Data that has already been collected, processed, and published by someone else for some other purpose.
Census Method
A method of statistical enquiry where data is collected from each and every unit of the population.
Sampling Method
A method where data is collected from a representative small group (sample) chosen from the entire population to save time and cost.
Random Sampling
A sampling technique where every unit of the population has an equal and independent chance of being selected.
Pilot Survey
A small-scale preliminary test of the questionnaire and survey methods conducted before the main survey to identify and fix flaws.
Important Formulas
Board Exam Info
In the CBSE Class 11 Economics exam, this chapter typically carries around 4 to 6 marks. Common question types include differentiating between primary and secondary data, advantages and disadvantages of census vs. sampling methods, and short conceptual questions on types of sampling.
Frequently Asked Questions
What is the difference between primary and secondary data?
Primary data is original and collected firsthand by the investigator, whereas secondary data is already collected and published by someone else.
When should the census method be 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 is required.
What are the essential qualities of a good questionnaire?
A good questionnaire should have a limited number of questions, clear and simple language, logical sequence of questions, and should avoid personal or sensitive queries.
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