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A group of 20 patients is given the medication lipitor for four weeks to reduce their...

A group of 20 patients is given the medication lipitor for four weeks to reduce their cholesterol levels. The before mean value was 224 with a standard deviation of 15.3. After four weeks the same 20 patients had a mean cholesterol level of 203 with a standard deviation of 12.7. The mean of the difference is 21 with a standard deviation of 6.1. Test the hypothesis that there is no difference versus the alternative hypothesis that Lipitor is reducing the cholesterol levels at the 10% level of significance.

List the following:

H0 =

Ha =

α =

Test statistic =

Pv =

Decision =

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