A common claim is that garlic lowers cholesterol levels. In a test of the effectiveness of garlic, 35 subjects were treated with doses of raw garlic, and their cholesterol levels were measured before and after the treatment. The changes in their levels of LDL cholesterol (in mg/mL) have a mean of 3.77 mg/mL and a standard deviation of 21.7 mg/mL. Construct a 90% confidence interval for the mean net change in LDL cholesterol after the garlic treatment. Procedure:       Assumptions: (select everything that applies) Population standard deviation is known The number of positive and negative responses are both greater than 10 Simple random sample Population standard deviation is unknown Sample size is greater than 30 Normal population Unknown parameter:

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