In a test of the effectiveness of garlic for lowering​ cholesterol, 44 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes ​(before−​after) in their levels of LDL cholesterol​ (in mg/dL) have a mean of 3.4 and a standard deviation of 18.8. 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?       What is the confidence interval estimate of the population mean μ​?   (?) ​mg/dL<μ<(?) ​mg/dL ​(Round to two decimal places as​ needed.) What does the confidence interval suggest about the effectiveness of the​ treatment?     A. The confidence interval limits contain ​0, suggesting that the garlic treatment did not affect the LDL cholesterol levels.   B. The confidence interval limits do not contain ​0, suggesting that the garlic treatment did affect the LDL cholesterol levels.   C. The confidence interval limits contain ​0, suggesting that the garlic treatment did affect the LDL cholesterol levels.   D. The confidence interval limits do not contain ​0, suggesting that the garlic treatment did not affect the LDL cholesterol levels.

MATLAB: An Introduction with Applications
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In a test of the effectiveness of garlic for lowering​ cholesterol,
44
subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes
​(before−​after)
in their levels of LDL cholesterol​ (in mg/dL) have a mean of
3.4
and a standard deviation of
18.8.
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?
 
 
 
What is the confidence interval estimate of the population mean
μ​?
 
(?)
​mg/dL<μ<(?)
​mg/dL
​(Round to two decimal places as​ needed.)
What does the confidence interval suggest about the effectiveness of the​ treatment?
 
 
A.
The confidence interval limits
contain
​0, suggesting that the garlic treatment
did not
affect the LDL cholesterol levels.
 
B.
The confidence interval limits
do not contain
​0, suggesting that the garlic treatment
did
affect the LDL cholesterol levels.
 
C.
The confidence interval limits
contain
​0, suggesting that the garlic treatment
did
affect the LDL cholesterol levels.
 
D.
The confidence interval limits
do not contain
​0, suggesting that the garlic treatment
did not
affect the LDL cholesterol levels.
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