In a test of the effectiveness of garlic for lowering cholesterol, 45 subjects w

Question

In a test of the effectiveness of garlic for lowering cholesterol, 45 subjects were treated with garlic in a processed tablet form Cholesterol levels were measured before and after the treatment. The changes in their levels of LDL cholesterol (in mg/dL) have a mean of 4.9 and a standard deviation of 15.5. Complete parts (a) and (b) below Click here to view a t distribution table Click here to wew page 1 of the standard normal distribution table a. What is the best point estimate of the population mean net change in LDL cholesterol alter the garlic treatment? The best point estimate is mgldl (Type an integer or a decimal) b. Construct a 99% cortidence interval estimate of the mean net change in LDL cholesterol ater the ganc treatment What does the confidence interval suggest about the effectiveness of garlic in reducing LDL cholesterol? What is the confidence interval estimate of the population mean ?? (Round to two decimal places as needed ) What does the confidence interval suggest about the effectiveness of the treatment? O A. The confidence interval limits contain 0, suggesting that the garlic treatment did affect the LDL cholesterol levels O B. The confidence interval limits do not contain 0, suggesting that the garlic treatment did not afect the LDL cholesterol levels O C. The confidence interval limits contain O, suggesting that the garlic treatment did not affect the LDL cholesterol levels. AC D. The confdence interval limits do not contan 0, suggesting that the gatc treatment did affect the LDL cholesterol levels

Explanation / Answer

solution:-
a. point estimation is 4.9

b. given that n = 45 ,
99% confidence with df = 45 - 1 = 44 is t = 2.692
confidence interval formula = x +/- t * s / sqrt(n)
=> 4.9 +/- 2.692 * 15.5 / sqrt(45)
=> 4.9 +/- 6.2201
=> (-1.32 , 11.12)

what does the confidence interval suggest about the effectiveness of the treatment
option C. The confidence interval limits contain 0., suggesting that the garlic treatment did not affect the LDL cholesterol levels.

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