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What kind of a sample must be used for statistical analysis?

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What kind of a sample must be used for statistical analysis?

(a) A random sample

(b) A sample having excessive representation of a relation

(c) A sample having suppressive representation of a relation

(d) None of the mentioned

I have been asked this question in an interview for internship.

This is a very interesting question from Estimating Statistics of Expression Results topic in portion Query Processing and Optimization of RDBMS

1 Answer

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Best answer
Correct option is (a) A random sample

The best I can explain: A random sample must be taken into consideration for statistical analysis because it gives a fair result on the data analysis.

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