Collection of Data — Chapter Summary
ICSE · Class 11 · Economics
Summary of Collection of Data for ICSE Class 11 Economics. Key concepts: Primary data are original, Secondary data are data and Internal data are obtained.
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Overview
Collection of data is the first step in statistical enquiry. Economic analysis depends on relevant information about income, output, employment, prices, population, and many other variables. Data may be collected directly by the investigator or obtained from existing records. The chapter explains th
Key Concepts
Primary data are original
Primary data are original, first-hand data collected by the investigator for the first time for a specified purpose. They are fresh data collected dir
Secondary data are data collected by
Secondary data are data collected by someone else and used by another person or institution. Published data are necessarily secondary data.
Internal data are obtained from
Internal data are obtained from the internal reports and records of an organisation and remain under its control.
External data are collected from outside
External data are collected from outside the organisation. They may be primary or secondary in nature.
Census method means studying every unit
Census method means studying every unit of the universe. It is also called complete enumeration.
Learning Objectives
- Understand the meaning of primary and secondary data
- Distinguish between internal and external sources of data
- Explain different methods of collecting primary data
- Compare census method and sampling method
- Identify major sampling techniques and their features
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Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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