Assertion (A): Direct personal investigation is always the most suitable method for data collection. Reason (R): It provides original and highly accurate data.
A.Both A and R are true, but R is not the correct explanation of A
B.A is true, but R is false
C.A is false, but R is true
D.Both A and R are true, and R is the correct explanation of A
Explanation:
Agreement can be both truth or both lie. P(both truth)=0.6×0.7=0.42; both lie=0.4×0.3=0.12. Total agreement=0.54. Probability truth given agreement = 0.42/0.54 ≈ 0.7778.
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