In a test of the effectiveness of garlic for lowering cholesterol, 48 subjects w

Question

In a test of the effectiveness of garlic for lowering cholesterol, 48 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after treatment. The changes in their levels of LDL cholesterol have a mean of 4.3 and a standard deviation of 17.5 a) what is the best point estimate of the population mean net change in LDL cholesterol after the garlic treatment. The best point estimate is ___. b)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 using garlic in reducing LDL cholesterol? What is the confdence interval estimate of the population mean u? ___mg/dl < u< __mg/dl

Explanation / Answer

1) best point estimate of the population mean net change in LDL cholesterol after the garlic treatment. The best point estimate is =4.3

b) std error =std deviation/(n)1/2 =2.526

for 99% CI at 47 degree of freedom t=2.685

hence confidence interval =mean +/- t*std error =-2.4809 ; 11.0809

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