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Let:
X1 and X2 be quantitative and verbal scores on an exam
Y1 and Y2 be quantitative and verbal scores on another exam
If:
Cov(X1, Y1) = 5
Cov(X1, Y2) = 1
Cov(X2, Y1) = 2
Cov(X2, Y2) = 8
What is the covariance between the two total scores X1+X2 and Y1+Y2?
Sam Hill, Director of Media Research in Christchurch,
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