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Question: Patients with high cholesterol were administered a cholesterol lowering drug. Suppose the patients were selected at random from a normally distributed population. The following table shows the results of each patient.

Before 180 190 175 160 165 170 185

After   175 180 170 165 160 170 180

 

Can the researchers claim that their drug is effective at the 99% confidence level? State the null and alternative hypothesis and test the claim

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