Question

In a test of the effectiveness of garlic for lowering cholesterol, 42 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 5.6 and a standard deviation of 19.2. 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?

Name: in a test of the effectiveness of garlic for lowering cholesterol 42 subjects were treated with garlic in a processed tablet form cholesterol levels were measured before and after the treatm 02153
Uploaded: 2022-07-22T23:25:58-08:00
Duration: 6 min 8 s
Channel: Teresa Wray
Description: in a test of the effectiveness of garlic for lowering cholesterol 42 subjects were treated with garlic in a processed tablet form cholesterol levels were measured before and after the treatm 02153

          In a test of the effectiveness of garlic for
lowering cholesterol, 42 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 5.6 and a
standard deviation of 19.2. 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?

Added by Magdalena J.

Elementary Statistics a Step by Step Approach

Allan G. Bluman 9th Edition

Instant Answer

Solved by Expert Teresa Wray

07/22/2022

Step 1

Given that the standard deviation is 19.2 and the sample size is 42, the standard error is calculated as \( \frac{19.2}{\sqrt{42}} \approx 2.96 \). To find the margin of error, we use the t-score for a 95% confidence interval with 40 degrees of freedom, which is Show more…

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In a test of the effectiveness of garlic for lowering cholesterol, 42 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 5.6 and a standard deviation of 19.2. 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?