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July 24, 2014

July 24, 2014

Posted by **Anonymous** on Monday, October 29, 2012 at 3:28pm.

The standard deviation is fixed.

The sampling distribution of z is normal.

The sampling distribution of the sample means is approximately normal.

There is no special assumption made.

I would think D, no special assumption.

- AP Statistics -
**MathGuru**, Tuesday, October 30, 2012 at 6:49pmI would also say D. If a problem does not say "assuming a normal distribution" in its statement, then one can use the t-distribution instead for smaller sample sizes (less than 30).

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