Question: Given are two tests X and Y with = 16.0, = 16.0, XX = YY = 0.8, and XY = 0.7. a. Compute the observed-score

Given are two tests X and Y with = 16.0, = 16.0, ρXX′ =

ρYY′ = 0.8, and ρXY = 0.7.

a. Compute the observed-score variance, the true-score variance, and the reliability of the difference scores X – Y.

b. Compare the variance of the raw score differences with of Equation 4.18.

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