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A Test of Infant Development Contains Three Scales: (1)Cognitive Ability,(2)Motor

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A test of infant development contains three scales: (1) Cognitive Ability,(2) Motor Development,and (3) Behavior Rating.Because these three scales are designed to measure different characteristics (that is,they are not homogeneous) ,it would be inappropriate to combine the three scales in calculating estimates of the test's


A) alternate-forms reliability.
B) internal-consistency reliability.
C) test-retest reliability.
D) interrater reliability.

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