Posted by **Cheri** on Wednesday, December 27, 2006 at 4:57pm.

Trying to finish an assignment: What happens to the power of the z test when the standard deviation increases? and Is the shape of a sampling distribution always the same as that of the null hypothesis population? Thanks!

As the SD increases, the exactness of the estimate of a population mean is less.

The null hypothesis usually assumes a normal distribution. As I mentioned in your later post, assu7ming that the distribution isdue to chance factors, the sampling distribution will approximate a normal distribution more closely as the sample size increases.

I hope this helps a little more. Thanks for asking.

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