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OpenStudy (anonymous):
Suppose X and Y are independent random variables. The variance of X is equal to 16; and the variance of Y is equal to 9. Let Z = X - Y. What is the standard deviation of Z?
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OpenStudy (anonymous):
SD Z = SD X-Y = sqrt(Var X-Y) = sqrt(VarX +Y) = sqrt(Var x + Var Y) = sqrt 16+9 =5
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