Is it true that if Corr(X 1 ,X 2 ) = 1, then X 1 = cX
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Is it true that if Corr(X1,X2) = 1, then X1 = cX2 for a c > 0? Answer the same question under the additional condition E{X1} = E{X2} = 0. Let mi = E{Xi}, i = 1,2. Is it true that if Corr(X1,X2) = 1, then X1−m1 = c(X2−m2) for a c > 0?
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