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?

MATLAB: An Introduction with Applications
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In a test of the effectiveness of garlic for lowering​ cholesterol, 50 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 2.8 and a standard deviation of 16.5 .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 mu​?

 
​mg/dLless than muless than ​mg/dL
​(Round to two decimal places as​ needed.)
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