Question

- A serum cholesterol level above 250 mg/dl of blood is a risk factor for cardiovascular disease in humans. At a medical center in St. Louis, a study to test the effectiveness of new cholesterol-lowering drug was conducted. One hundred people with cholesterol levels between 250 mg/dl and 300 mg/dl were available for this study. Fifty people were assigned at random to each of two treatment groups. One group received the standard cholesterol-lowering medication and the other group received the new drug. After taking the drug for three weeks, the 50 subjects who received the standard treatment had a mean decrease in cholesterol level of 10 mg/dl with a standard deviation of 8 mg/dl and the 50 subjects who received the new drug had a mean decrease of 18 mg/dl with a standard deviation of 12 mg/dl.

Does the new drug appear to be more effective than the standard treatment in lowering mean cholesterol level?

- Write the null and alternative hypotheses to test this claim.

- Perform a two sample t-test for the difference of two mean. What is the value of the test statistic?

- What is the associated P-Value?

- State your conclusion using .

- Create a 95% confidence interval for the true mean difference in effectiveness of treatment.

Answer #1

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, 50 subjects were treated with garlic in a process
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 18.1. 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, 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 (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, 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, 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 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 (beforeminusafter) in their levels of LDL
cholesterol (in mg/dL) have a mean of 3.7 and a standard deviation
of 19.3. 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 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...

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...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 20 minutes ago

asked 24 minutes ago

asked 29 minutes ago

asked 43 minutes ago

asked 50 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 3 hours ago