Posted by **Tracey** on Tuesday, June 5, 2012 at 9:41am.

Suppose X has a mound-shaped distribution with sigma=9. A random sample of size 36 has a sample mean 20. Is it appropriate to use a normal distribution to compute a confidence interval for the population mean u?

- statistics -
**PsyDAG**, Tuesday, June 5, 2012 at 10:49am
As long as the mound approximates a normal distribution, yes.

- statistics -
**Stephanie**, Monday, October 27, 2014 at 12:29pm
Yes, when the sample size is larger than 30, you assume a normal distribution instead of using the student's t distribution.

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