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April 20, 2014

Homework Help: statistics

Posted by sai on Friday, January 6, 2012 at 1:03pm.

You are conducting an experiment to see if a given therapy works to reduce test
anxiety in a sample of college students. A standard measure of test anxiety is known to
produce a  = 19. In the sample you draw of 86 the mean is equal 17.5 with standard
deviation s = 10.
a- Use an level of 0.05 to test the hypothesis that the mean is less than 19.
b- Find the 95 % one sample con dence interval for the mean.

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