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The reliability of half of a test (odd-even split) is found to be 0.60. Using the Spearman–Brown prophecy formula, what is the estimated re…

2725Hard UPSC Principal Vice Principal 0 replies 1 views

The reliability of half of a test (odd-even split) is found to be 0.60. Using the Spearman–Brown prophecy formula, what is the estimated reliability of the full test?

A0.60
B0.65
C0.75
D0.80

Correct answer: C

Explanation

r = 2 × 0.60 / (1 + 0.60) = 1.2 / 1.6 = 0.75.

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