Which of the following is a characteristic of Kuder-Richardson Formula 21?
A. It is based on the assumption that reliability usually decreases as a test increases in length.
B. It gives a conservative estimate of reliability when test items vary in difficulty.
C. Its primary problem is the difficulty of constructing two tests that are equivalent in content and item characteristics.
D. It requires the administration of equivalent forms of a test to the same group and calculation of the correlation coefficient.
Answer: B
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