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In order to test the effectiveness of a drug called XZR designed to reduce cholesterol levels, 9 heart patients' cholesterol levels are measured before they are given the drug. The same 9 patients use XZR for two continuous months. After two months of continuous use the 9 patients' cholesterol levels are measured again. The comparison of cholesterol levels before vs after administering the drug is an example of testing the difference between: a)matched pairs from two dependent populations b) two population variances from independant populations c)two means from independent populations d)two population proportions.

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