For a random variable, X, let \(\bar{X}\) be the sample average. The sample size is n. The mean and the standard deviation of X are μ and σ, respectively. The standard deviation of \(\bar{X}\) is

For a random variable, X, let \(\bar{X}\) be the sample average. The

1.	For a random variable, X, let \(\bar{X}\) be the sample average. The sample size is n. The mean and the standard deviation of X are μ and σ, respectively. The standard deviation of \(\bar{X}\) is
A.	nσ
B.	σ
C.	\(\sigma \over n\)
D.	\(\sigma \over \sqrt{n} \)
Answer» E.

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For a random variable, X, let \(\bar{X}\) be the sample average. The sample size is n. The mean and the standard deviation of X are μ and σ, respectively. The standard deviation of \(\bar{X}\) is

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