Foruncorrelatedrandomvariables U, V , and W, let X = U + V and Y = U +

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Foruncorrelatedrandomvariables U, V , and W, let X = U + V and Y = U + W.

(a) What happenstothecorrelationbetween X and Y when weconditionon U bykeepingitfixed;(b)

Explain howaspuriousassociationcanoccur.

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