Discussion
In an alternate form reliability in delayed type, the source of error variance would be :
(I) Content sampling
(II) Time sampling
Answer: C
Both are sources of error, so the answer is Both (I) and (II).
Alternate-form reliability correlates scores on two equivalent forms of a test. If the forms are given in immediate succession, the only source of error is content sampling, the fact that the two forms use different items. If they are given after a delay, scores can also change with the person's state and with time, adding time sampling error, as in test-retest reliability.
So the delayed type combines both sources, and options naming only one, or neither, are incomplete.
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