Question: +Show that the variance of X1 can be written as the sum of true-score variance,2 , and measurement error variance,

+Show that the variance of X1 ¼ τ þ δ can be written as the sum of ‘‘true-score variance,’’σ2

τ , and measurement error variance, σ2

δ . (Hint: Square both sides of Equation 6.10 and take expectations.)

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