1.In a test of the effectiveness of garlic for loweringcholesterol, 44 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes (beforeafter) in their levels of LDL cholesterol(in mg/dL) have a mean of 5.7 and a standard deviation of 15.7. Construct a 95% confidence interval estimate of the mean net change in LDL cholesterol after the garlic treatment. What does the confidence interval suggest about the effectiveness of garlic in reducing LDLcholesterol?

What is the confidence interval estimate of the population mean ?

......mg/dL<<......mg/dL (Round to two decimal places asneeded.)

2.A food safety guideline is that the mercury in fish should be below 1 part per million(ppm). Listed below are the amounts of mercury(ppm) found in tuna sushi sampled at different stores in a major city. Construct a 99% confidence interval estimate of the mean amount of mercury in the population. Does it appear that there is too much mercury in tunasushi?

0.620.770.100.991.320.530.80

What is the confidence interval estimate of the population mean ?

..... ppm<<..... ppm

(Round to three decimal places asneeded.)