Question

10. In a study to investigate the effect of diet on reducing cholesterol levels, a random...

10. In a study to investigate the effect of diet on reducing cholesterol levels, a random sample 15

subjects known to have high cholesterol had their cholesterol measured at the beginning of the study and again after 6 months on a special diet. The results are below. Suppose that you could assume that the differences in cholesterol are a simple random sample from normal population. d = 8 and so = 16 [d=before - after]

a) Perform the test if the special diet is effective at reducing cholesterol levels at 5%

significance level using P-value method.

b) Find a 90% confidence interval for the mean difference.

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A study examined the effect of garlic on blood cholesterol levels. A total of 192 subjects...
A study examined the effect of garlic on blood cholesterol levels. A total of 192 subjects with starting LDL (“bad cholesterol”) levels between 130 and 190 mg/dl were randomly assigned to one of four treatments for six months: raw garlic eaten daily, a powdered garlic supplement taken daily (Garlicin brand), an aged-garlic extract taken daily (Kyolic brand), or a placebo pill taken daily. The study found no significant or clinical differences in blood cholesterol levels between the four groups at...
A drug company is analyzing the effectiveness of a cholesterol reducing medication. A random sample of...
A drug company is analyzing the effectiveness of a cholesterol reducing medication. A random sample of 9 subjects with high cholesterol were tested before and after three weeks of treatment with the drug and data appears in the table below. Assume cholesterol levels are normal. Find a 90% confidence interval for the mean difference in cholesterol level after treatment. What is the margin of error and confidence interval? Level before: 177   169   173   174   180   179   184   171   185 Level...
8. A study was conducted to investigate the effectiveness of hypnotism in reducing pain. Results for...
8. A study was conducted to investigate the effectiveness of hypnotism in reducing pain. Results for randomly selected subjects are the following: Subject A B C D E F G H Before 6.6 6.5 9.0 10.3 11.3 8.1 6.3 11.6 After 6.8 2.4 7.4 8.5 8.1 6.1 3.4 2.0 The measurements are in centimeters on a pain scale. Higher values correspond to greater levels of pain. Perform a hypothesis test to determine if Hypnotism is effective in reducing pain.
Question 2 (1 point) Suppose that the mean cholesterol level for males aged 50 is 241....
Question 2 (1 point) Suppose that the mean cholesterol level for males aged 50 is 241. An investigator wishes to examine whether cholesterol levels are significantly reduced by modifying diet only slightly. A sample of 12 patients agrees to participate in the study and follow the modified diet for 3 months. After 3 months, their cholesterol levels are measured and the summary statistics are produced on the n = 12 subjects. The mean cholesterol level in the sample is 235...
A medical research team conducted a study to test the effect of a cholesterol-reducing medication. At...
A medical research team conducted a study to test the effect of a cholesterol-reducing medication. At the end of the study, the researchers found that of the 4700 randomly selected subjects who took the medication, 301 died of heart disease. Of the 4300 randomly selected subjects who took a placebo, 357 died of heart disease. At a = 0.05, can you support the claim that the death rate due to heart disease is lower for those who took the medication...
A group of adults with elevated cholesterol levels participated in a diet and exercise program to...
A group of adults with elevated cholesterol levels participated in a diet and exercise program to determine the effect of this program on their cholesterol. The resulting data follows: Subject Before After 1 259 244 2 260 250 3 272 246 4 260 235 5 281 273 6 254 245 Test the hypothesis that the diet and exercise program lowered the subject's total chloresterol by at least 15 points. alpha = .05. a. Find the mean of the differences.   b....
In a study on the effect of diet on blood glucose levels, 26 subjects were assigned,...
In a study on the effect of diet on blood glucose levels, 26 subjects were assigned, at random, to one of four diets. The recorded blood glucose levels are in mmol per liter. Diet A B C D 6.0 6.5 7.5 7.5 4.5 5.3 8.0 7.0 6.3 5.8 7.3 6.8 5.8 6.3 6.3 5.8 5.5 5.0 7.8 7.8 6.0 8.3 6.3 5.0 7.3 7.0 A-How many groups? Calculate the dfb and dfw?                                B-The H0 there are no difference in...
Read the scenario and answer the question that follows: An experiment was set up to study...
Read the scenario and answer the question that follows: An experiment was set up to study two drugs, Lipanthyl and Befizal, based on their effect on cholesterol level in blood. A group of 25 men with high cholesterol level were randomly assigned one of the two drugs. The level of LDL was measured right before the treatment and again after the 3-month treatment. Suppose we wanted to compare the LDL levels of the subjects on Lipanthyl versus those on Befizal....
A study was conducted to measure the effectiveness of hypnotism in reducing pain. The measurements are...
A study was conducted to measure the effectiveness of hypnotism in reducing pain. The measurements are centimeters on a pain scale before and after hypnosis. Assume that the paired sample data are simple random samples and that the differences have a distribution that is approximately normal. Construct a​ 95% confidence interval for the mean of the "before−​after"differences. Does hypnotism appear to be effective in reducing​ pain? Before 8.4 7.8 8.4 9.0 12.3 6.9 5.9 2.4 After 6.6 2.9 7.9 8.3...
A study was conducted to measure the effectiveness of hypnotism in reducing pain. The measurements are...
A study was conducted to measure the effectiveness of hypnotism in reducing pain. The measurements are centimeters on a pain scale before and after hypnosis. Assume that the paired sample data are simple random samples and that the differences have a distribution that is approximately normal. Construct a​ 95% confidence interval for the mean of the ​"before minus−​after" differences. Does hypnotism appear to be effective in reducing​ pain? Before 5.6, 2.5, 10.0, 7.9, 7.9, 6.8, 3.2, 6.5 After 6.5, 2.8,...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT