Question

n 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 (before-after) in their levels of LDL cholesterol (in mg/dL) have a mean of 4.6 and a standard deviation of 16.3. 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 the effectiveness of garlic in reducing LDL cholesterol?

What is the confidence interval estimate of the population mean u?

Answer #1

The 90 % confidence interval of , the population mean of the net change in LDL cholesterol after the garlic treatment is :

where ,

Degrees of freedom = 43-1=42

Now ,

**Required confidence interval :
**

**Since , the confidence interval doesnot contain the
value 0 or any negative value , hence we can say that the new
treatment with garlic has no effect in reducing the cholesterol
level .**

**The confidence interval estimate of the population mean
is
**

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,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 (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, 44 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 5.3 and a standard deviation
of 16.3. 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 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, 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...

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, 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...

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