SOLUTION: 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 a

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Question 1161734: 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 ​(beforeminus​after) in their levels of LDL cholesterol​ (in mg/dL) have a mean of 5.4 and a standard deviation of 16.4. 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 LDL​ cholesterol?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
The 95% CI half interval is t (0.975, df=48)*s/sqrt (n)
t=2.01
half-interval is 2.01*16.4/7=4.71
add to and subtract from mean
(0.69, 10.11) mg % are units
The CI suggests that there is a positive change since 0 is not in the confidence interval. It would suggest that garlic does help reduce LDL.