The sample data below are changes in LDL cholesterol levels in clinical trials of Lipitor (atorvastatin). It was claimed that Lipitor had an effect on LDL cholesterol. Negative values represent decreases in LDL cholesterol. Use a 0.05 significance level to test the claim that for those treated with 20 mg of atorvastatin and those treated with 80 mg of atorvastatin, changes in LDL cholesterol have the same median. What do the results suggest?

Group treated with 20 mg of atorvastatin:

Group treated with 80 mg of atorvastatin:

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2832 29-393135-25 36-35 -26 -29 -34 -30 -424 38-42-40432 374 37 -34 -31