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## #1 2012-10-03 23:45:21

cassrl
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### statistics

A standard measure of test anxiety is knnown to produce a u=19.  In the sample you draw of 86 the mean is equal 17.5 with a standard deviation s=10.

a-Use a level of 0.05 to test the hypothesis that the mean is less than 19.
b-find the 95% one sample confidence interval for the mean.

## #2 2012-10-04 02:16:42

bobbym

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### Re: statistics

Hi cassrl;

What have you done with this problem? What is the null hypthesis and the alternative one? Do you know how to start the problem? How to get z here? Is it a two tailed test or a one tailed? Can I see a little of your work?

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.