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{"ops":[{"insert":"Researchers wish to test the effectiveness of a certain drug in lowering the cholesterol levels in individuals aged 50-60 years old. The mean cholesterol levels in previous researches for this age group is 250 mg\/dL. The normal range is 200-239 mg\/dL. 50 participants were invited to the study, The mean cholesterol levels for the participants after a month of taking the medication is 237 mg\/dL with a standard deviation of 4 mg\/dL. Assuming a normal distribution of times of labor, test at the 10% level of significance test whether the mean cholesterol level is less than 250 mg\/dL. "},{"insert":"\n"}]}
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