If Q = -1, attributes exhibit: MCQ with Answer and Explanation

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If Q = -1, attributes exhibit:

A. Perfect positive association

B. No relationship

C. Independence

D. Perfect negative association

Answer: Option D

Solution (By JKSSB Mock Tests)

Q = -1 when ad=0, i.e., complete negative association.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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Given P(A)=0.7, P(B)=0.5, and P(A∩B)=0.45. Which statement is correct?

A. A and B are dependent, and P(A|B) = 0.9.

B. A and B are independent.

C. P(A∪B) = 0.8.

D. A and B are mutually exclusive.

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Correct Answer: Option A

Explanation:
P(A|B)=0.45/0.5=0.9 ≠ P(A)=0.7, so dependent. P(A∪B)=0.7+0.5-0.45=0.75 ≠ 0.8.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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If events A and B are independent, which of the following must be true?

A. P(A) + P(B) = 1

B. P(A ∩ B) = 0

C. A and B are mutually exclusive

D. P(A|B) = P(A)

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Correct Answer: Option D

Explanation:
Independence means knowledge of B does not affect A's probability, so P(A|B) = P(A); this is equivalent to P(A∩B)=P(A)P(B).

This question belongs to: Accountancy and Statistics Statistics

Question #3

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In questionnaire design, what is the primary purpose of pre-testing?

A. To finalize the sample size for the survey

B. To identify ambiguous questions and improve clarity before full deployment

C. To calculate the budget for data collection

D. To select the mode of administration for the questionnaire

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Correct Answer: Option B

Explanation:
Pre-testing a questionnaire with a small pilot group helps detect unclear wording, logical flaws, or response issues, ensuring the instrument is valid and reliable for the main survey.

This question belongs to: Accountancy and Statistics Statistics

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