Class 11 Economics - PUNJAB
Collection of Data
The chapter 'Collection of Data' in Class 11 Economics introduces students to the foundational steps of statistical enquiry. It covers the primary sources of data, such as direct personal investigation and oral interviews, and secondary sources like published and unpublished reports. Students learn about the various methods of collecting data, including census and sample surveys, along with essential sampling techniques like random and non-random sampling. Furthermore, the chapter highlights the importance of designing good questionnaires and sheds light on crucial national data sources in India, such as the Census and reports by the NSSO, which are vital for board exams.
Start Learning FreeKey Concepts
Primary Data
Data originally collected for the first time by the investigator for a specific purpose, making it first-hand information.
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 every single unit of the population or universe.
Sampling Method
A method where data is collected from a representative small group (sample) chosen from the entire population to save time and cost.
Pilot Survey
A small-scale preliminary test of the questionnaire conducted before the actual survey to check for errors and flaws.
Important Formulas
Board Exam Info
In the Punjab School Education Board (PSEB) Class 11 Economics examination, this chapter typically carries around 6 to 8 marks. Common question types include short answer questions differentiating between primary and secondary data, conceptual questions on census vs. sample methods, and numerical or practical questions on questionnaire design and sampling errors.
Frequently Asked Questions
What is the main difference between primary and secondary data?
Primary data is original and collected first-hand 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, high accuracy is required, and units of the population have diverse characteristics.
What are NSSO and Census of India?
They are major national agencies in India that regularly collect, process, and publish secondary socioeconomic and demographic data.
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