Question

In a test of the effectiveness of garlic for lowering cholesterol,

4848

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

4.14.1

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 of garlic in reducing LDL cholesterol?Click here to view a t distribution table.

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Click here to view page 1 of the standard normal distribution table.

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Click here to view page 2 of the standard normal distribution table.

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What is the confidence interval estimate of the population mean

muμ?

negative 1.07−1.07

mg/dLless than<muμless than<9.279.27

mg/dL

Answer #1

t critical value at 0.05 with 47 df = 2.012

95% confidence interval for is

- t * S / sqrt(n) < < + t * S / sqrt(n)

4.1 - 2.012 * 17.8 / sqrt(48) < < 4.1 + 2.012 * 17.8 / sqrt(48)

-1.07 < < 9.27

Since 0 contained in this confidence interval, the garlic for
lowering cholesterol test is **not effective.**

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In a test of the effectiveness of garlic for lowering
cholesterol, 44 subjects were treated with garlic in a processed
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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 (beforeminusafter) in their levels of LDL
cholesterol (in mg/dL) have a mean of 4.2 and a standard deviation
of 15.5. 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, 49 subjects were treated with garlic in a processed
tablet form. Cholesterol levels were measured before and after the
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cholesterol, 42 subjects were treated with garlic in a processed
tablet form. Cholesterol levels were measured before and after the
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cholesterol (in mg/dL) have a mean of 4.9 and a standard deviation
of 16.9. 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, 49 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 3.9 and a standard
deviation of 19.1. Construct a 99% confidence interval estimate of
the mean net change in LDL cholesterol after the garlic treatment.
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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 4.9 and a standard deviation
of 15.4. 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
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In a test of the effectiveness of garlic for lowering
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