Question

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 in their levels of LDL cholesterol (in mg/dL) have a mean of 5.7 and a standard deviation of 19.7. Complete parts (a) and (b) below. a. What is the best point estimate of the population mean net change in ldl cholesterol after garlic treatment? b. Construct a 90% 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? c. What does the confidence interval suggest about the effectiveness of the treatment?

Answer #1

In a test of the effectiveness of garlic for lowering
cholesterol, 4747 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 5.3 and a standard deviation
of 19.7. 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...

In a test of the effectiveness of garlic for lowering
cholesterol,43 subjects were treated with garlic in a processed
tablet form. Cholesterol levels were measured before and after the
treatment. The changes (beforeafter) in their levels of LDL
cholesterol (in mg/dL) have a mean of 5.7 and a standard deviation
of 15.2. 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...

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 (beforeminusafter) in their levels of LDL
cholesterol (in mg/dL) have a mean of 4.8 and a standard deviation
of 19.6. Construct a 99% confidence interval estimate of the mean
net change in LDL cholesterol after the garlic treatment. What does
the confidence interval suggest about the effectiveness...

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 4.1and a standard deviation
of 16.3 Construct a 99 % confidence interval estimate of the mean
net change in LDL cholesterol after the garlic treatment. What does
the confidence interval suggest about the...

In a test of the effectiveness of garlic for lowering
cholesterol, 43 subjects were treated with garlic in a processed
tablet form. Cholesterol levels were measured before and after the
treatment. The changes (beforeminusafter) in their levels of LDL
cholesterol (in mg/dL) have a mean of 3.6 and a standard deviation
of 16.7. Construct a 90% confidence interval estimate of the mean
net change in LDL cholesterol after the garlic treatment. What does
the confidence interval suggest about the effectiveness...

In a test of the effectiveness of garlic for lowering
cholesterol, 43 subjects were treated with garlic in a processed
tablet form. Cholesterol levels were measured before and after the
treatment. The changes (beforeminusafter) in their levels of LDL
cholesterol (in mg/dL) have a mean of 3.8 and a standard deviation
of 18.5. Construct a 99% confidence interval estimate of the mean
net change in LDL cholesterol after the garlic treatment. What does
the confidence interval suggest about the effectiveness...

In a test of the effectiveness of garlic for lowering
cholesterol, 47 subjects were treated with garlic in a processed
tablet form. Cholesterol levels were measured before and after the
treatment. The changes (before minus −after) in their levels of
LDL cholesterol (in mg/dL) have a mean of 2.8 and a standard
deviation of 18.4. 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...

In a test of the effectiveness of garlic for lowering
cholesterol,
5050
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
3.33.3
and a standard deviation of
17.817.8.
Construct a
9595%
confidence interval estimate of the mean net change in LDL
cholesterol after the garlic treatment. What does the confidence
interval suggest about the effectiveness...

In
a test of the effectiveness of garlic for lowering cholesterol, 47
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 3.2 and a standard deviation of 19.3.
Construct a 90% confidence interval estimate of the mean net change
in LDL cholesterol after the garlic treatment. What does the
confidence interval suggest about...

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 3.7 and a standard deviation
of 17.2.
Construct a 99% confidence interval estimate of the mean net
change in LDL cholesterol after the garlic treatment. What does the
confidence interval suggest about the effectiveness...

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