Question

In a test of the effectiveness of garlic for lowering​ cholesterol, 49 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes ​(before minus​ after) in their levels of LDL cholesterol​ (in mg/dL) have a mean of 3.9 and a standard deviation of 19.1. Construct a 99​% 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 LDL​ cholesterol? Click here to view a t distribution table. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. What is the confidence interval estimate of the population mean mu​? nothing ​mg/dL less than mu less than nothing ​mg/dL ​(Round to two decimal places as​ needed.)

Answer 1

conclude it by following the interval. As this interval contains zero so it always does prefer to conclude that there is no sufficient evidence of effectiveness of the garlic to reduce cholesterol levels