If P(A|B) > P(A), then: MCQ with Answer and Explanation

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If P(A|B) > P(A), then:

A. A and B are independent

B. B has a negative influence on A

C. A and B are mutually exclusive

D. B positively influences the probability of A

Answer: Option D

Solution (By JKSSB Mock Tests)

Conditional probability greater than unconditional indicates a positive association.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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If P(A)=0.4, P(B)=0.3, and A, B are mutually exclusive, then P(A∪B) is:

A. 0.12

B. 0.1

C. 0.7

D. 0.58

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Correct Answer: Option C

Explanation:
P(A∪B) = P(A)+P(B) = 0.4+0.3=0.7.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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Pre-testing of a questionnaire refers to:

A. Analyzing pilot data

B. Administering the questionnaire to the actual sample

C. Printing the questionnaire

D. Trying out the questionnaire on a small group to identify problems

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Correct Answer: Option D

Explanation:
Pre-test (pilot study) helps detect ambiguous questions and practical difficulties before the main survey.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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If Yule's coefficient Q = 0 for attributes A and B, this indicates:

A. Perfect positive association

B. No association (independence)

C. Perfect negative association

D. Data inconsistency

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Correct Answer: Option B

Explanation:
Yule's Q = 0 when (AB)(αβ) = (Aβ)(αB), which is the condition for statistical independence between attributes A and B in a 2×2 table.

This question belongs to: Accountancy and Statistics Statistics

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