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If all possible samples of size n are drawn from an infinite population with a mean of 15 and a standard deviation of 5, then

If all possible samples of sizen are drawn from an infinite population with a mean of 15 and a standard deviation of 5, then the standard error of the sample mean equals 1.0 only for samples of size:

(A)5

(B)15

(C)25

(D)75

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