Show that r 2 defined in (3.5.5) ranges between 0 and 1. You may use the CauchySchwarz
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Show that r2 defined in (3.5.5) ranges between 0 and 1. You may use the Cauchy–Schwarz inequality, which states that for any random variables X and Y the following relationship holds true:
[E (XY)]2 ≤ E(X2) E(Y2)]
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