In a 2×2 attribute table, if (A)=400, (B)=500, N=1000, and observed (AB)=250, the expected (AB) under independence is: MCQ with Answer and Explanation

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In a 2×2 attribute table, if (A)=400, (B)=500, N=1000, and observed (AB)=250, the expected (AB) under independence is:

A. 400

B. 250

C. 200

D. 300

Answer: Option C

Solution (By JKSSB Mock Tests)

Expected (AB) = (A)×(B)/N = 400×500/1000 = 200,000/1000 = 200. Observed 250 > 200 suggests positive association between attributes A and B.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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For a symmetric distribution, which statement is correct?

A. Median = (Mean + Mode)/2

B. Mode = 3Median - 2Mean

C. Mean = Median = Mode

D. Mean - Mode = 3(Mean - Median)

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Correct Answer: Option C

Explanation:
In a perfectly symmetric distribution, all three central measures coincide.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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Which of the following is a function of census?

A. Issuing birth certificates

B. Conducting elections

C. Providing data on population size and characteristics

D. Collecting taxes

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Correct Answer: Option C

Explanation:
Census provides comprehensive demographic, social, and economic data.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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In the theory of attributes, the class frequency (Aβ) represents:

A. Number possessing A but not B

B. Number not possessing A but possessing B

C. Number possessing A and B

D. Number possessing neither

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Correct Answer: Option A

Explanation:
β indicates absence of B; (Aβ) = items with A and without B.

This question belongs to: Accountancy and Statistics Statistics

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