Class 11 Economics - WEST-BENGAL
Collection of Data
The chapter Collection of Data in Class 11 Economics under WBBSE introduces students to the foundational steps of statistical enquiry. It covers the difference between primary data, collected firsthand for a specific purpose, and secondary data, gathered from pre-existing sources like publications or government reports. Students learn various methods of data collection such as personal interviews, mailing questionnaires, and telephonic surveys, along with essential sampling techniques like random and non-random sampling. Understanding these concepts is vital for board exams as it forms the basis of statistical analysis and helps in conducting accurate economic research and interpreting socioeconomic data.
Start Learning FreeKey Concepts
Primary Data
Data collected for the first time by the investigator himself for a specific research purpose, making it original and reliable.
Secondary Data
Data that has already been collected, processed, and published by someone else, such as census reports or articles.
Census Method
A method of statistical enquiry where every single unit of the target population is studied, ensuring high accuracy but requiring high cost and time.
Sampling Method
A method where only a representative group (sample) is selected from the population to draw inferences about the entire group.
Random Sampling
A sampling technique where every individual in the population has an equal and independent chance of being selected.
Important Formulas
Board Exam Info
In the West Bengal (WBBSE) Class 11 Economics annual examination, this chapter typically carries around 6 to 8 marks. Questions usually include short-answer questions (SAQ), multiple-choice questions (MCQ), and descriptive questions differentiating between primary and secondary data or census and sampling methods.
Frequently Asked Questions
What is the main difference between primary and secondary data?
Primary data is original data collected firsthand by the investigator for a specific study, whereas secondary data is pre-existing data gathered from published or unpublished sources.
When should the census method be preferred over the sampling method?
The census method is preferred when the population size is small, high accuracy is required, and units possess diverse characteristics.
Why is random sampling considered better than non-random sampling?
Random sampling eliminates personal bias because every unit has an equal chance of selection, making the sample truly representative of the population.
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