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Collection of Data

CBSE Class 11 Statistics — Sources of data, methods of collection, questionnaire design, census and sampling.

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Topics(10)

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Statistical Enquiry and Sources of Data

Meaning of statistical enquiry, important terms, internal/external sources.

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2

Primary and Secondary Data

Meaning, sources, comparison, degree-based distinction.

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3

Methods of Collecting Primary Data

Six primary data collection methods.

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4

Construction of Questionnaire

Principles of questionnaire design, types of questions.

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5

Census and Sampling Methods

Census vs sampling, factors affecting sample size.

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6

Random Sampling Methods

Simple random, systematic, stratified, cluster sampling.

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7

Non-Random Sampling Methods

Convenience, purposive, quota, snowball sampling.

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8

Principles of Sampling and Statistical Errors

Principles of sampling, sampling vs non-sampling errors.

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9

Sources and Precautions of Secondary Data

Published and unpublished sources, precautions.

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10

Census of India and NSSO

Census of India and role of NSSO in data collection.

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