Question: A test X is given with three subtests, X1, X2, and X3. The variancecovariance matrix for the subtests is given in the table below. Estimate

A test X is given with three subtests, X1, X2, and X3. The variance–covariance matrix for the subtests is given in the table below. Estimate reliability with coefficient α.

X X X3 X 8.0 6.0 8.0 X 6.0 12.0 12.0 X

X X X3 X 8.0 6.0 8.0 X 6.0 12.0 12.0 X 8.0 12.0 17.0

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