For two attributes A and B, independence (no association) implies: MCQ with Answer and Explanation

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For two attributes A and B, independence (no association) implies:

A. (AB) = 0

B. (AB)/N = (A)/N × (B)/N

C. (AB) = (A) + (B)

D. (AB) = (A)(B)/N²

Answer: Option B

Solution (By JKSSB Mock Tests)

Independence means the proportion of items with both attributes equals the product of the individual proportions.

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

Question #1

If P(A)=0.6, P(B)=0.5, and P(A∩B)=0.3, then P(A'|B) is:

A. 0.6

B. 0.5

C. 0.4

D. 0.2

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Correct Answer: Option C

Explanation:
P(A'|B) = 1 - P(A|B). P(A|B) = 0.3/0.5 = 0.6. So P(A'|B)=0.4.

This question belongs to: Accountancy and Statistics Statistics

Question #2

A bag contains 3 red, 5 black balls. Two balls are drawn at random. The probability that they are of different colors is:

A. 15/56

B. 1/2

C. 15/28

D. 3/8

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Correct Answer: Option C

Explanation:
Total ways C(8,2)=28. 1 red 1 black = 3×5=15. Probability=15/28.

This question belongs to: Accountancy and Statistics Statistics

Question #3

Standardized death rate by direct method is computed as:

A. Crude death rate of standard population

B. Σ (M_x × p_x) where M_x are standard rates

C. Σ (m_x × P_sx) / Σ P_sx, where m_x are age-specific death rates of study population and P_sx are standard population age distribution

D. Simple average of age-specific rates

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Correct Answer: Option C

Explanation:
Direct standardization applies observed rates to a standard population structure.

This question belongs to: Accountancy and Statistics Statistics

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