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Suppose a large population has mean μ and standard deviation σ , and a simple random sample of size n is taken. The sampling distribution of the sample mean x has mean and variance respectively equal to

a. μ /n and σ 2/n.
b. μ and σ /n.
c. μ /n and σ 2/n2.
d. μ and σ 2/n.

Sagot :

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