A simple random sample of cholesterol levels (in mg/dl) from male cross-country runners is supplied in...
A simple random sample of cholesterol levels (in mg/dl) from male cross-country runners is supplied in Q1data.xlsx. Calculate and interpret an appropriate 90% confidence interval.
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A simple random sample of cholesterol levels (in mg/dl) from
male cross-country runners is supplied in...
Assume total cholesterol levels (TChol) are normally distributed with mean μ = 215 mg/dl and standard...
Assume total cholesterol levels (TChol) are normally distributed with mean μ = 215 mg/dl and standard deviation σ = 30 mg/dl for the adult American population. That is, TChol ~ N(215, 302). Total cholesterol values of 240 mg/dl or greater are considered high; and levels in the range of 200 to 240 are called borderline high. a. What proportion of this population do we expect to find with high cholesterol? What proportion do we expect to find with borderline high...
A pharmaceutical company has developed a new drug to reduce cholesterol. A regulatory agency will recommend...
A pharmaceutical company has developed a new drug to reduce cholesterol. A regulatory agency will recommend the new drug for use if there is convincing evidence that the mean reduction in cholesterol level after one month of use is more than 20 mg/dl. The company collected data by giving the new drug to a random sample of 50 people from the population of people with high cholesterol. The sample mean reduction was 24 mg/dl and the standard deviation was 15...
A pharmaceutical company has developed a new drug to reduce cholesterol. A regulatory agency will recommend...
A pharmaceutical company has developed a new drug to reduce cholesterol. A regulatory agency will recommend the new drug for use if there is convincing evidence that the mean reduction in cholesterol level after one month of use is more than 20 mg/dl. The company collected data by giving the new drug to a random sample of 50 people from the population of people with high cholesterol. The sample mean reduction was 24 mg/dl and the standard deviation was 15...
20. A medical center conducted a study to investigate cholesterol levels in people who have had...
20. A medical center conducted a study to investigate cholesterol levels in people who have had heart attacks. A random sample of 16 people was obtained from the names of all patients of the medical center who had a heart attack in the previous year. Of the people in the sample, the mean cholesterol level was 264.70 milligrams per deciliter (mg/dL) with standard deviation 42.12 mg/dL. Assuming all conditions for inference were met, whic of the following is a 90...
Over 9 months, a random sample of 100 women were asked to record their average menstrual...
Over 9 months, a random sample of 100 women were asked to record their average menstrual cycle length (in days). The sample average was 28.86 days, with a sample standard deviation of 4.24 days. (a) Calculate the lower bound for the 90% confidence interval for the true average menstrual cycle length. (b) Calculate the upper bound for the 90% confidence interval for the true average menstrual cycle length. (c) Interpret the confidence interval found in (a,b) in terms of the...
The distribution of serum cholesterol levels for the general population of adult males in the United...
The distribution of serum cholesterol levels for the general population of adult males in the United States is normal with a mean of 211 mg/dL and a standard deviation of 46 mg/dL. A researcher wishes to know if adult males who are hypertensive and who smoke differ significantly from this general population with regards to their serum cholesterol levels. The researcher randomly selects 25 adult male hypertensive smokers, measures their serum cholesterol levels, and calculates a mean of 217 mg/dL...
The last answer is incorrect so it's between a, b, or c Cholesterol levels of 16...
The last answer is incorrect so it's between a, b, or c
Cholesterol levels of 16 patients were taken following heart attacks at a major northeastern medical center. Cholesterol levels (mg/dL) were measured 2 days after the heart attack, and again on the same patients 14 days after the heart attack. Assume that the differences are normally distributed and that we can regard the sample as a simple random sample from the population. Based on the statistics provided below, what...
In a study to assess the effectiveness of garlic for lowering cholesterol, 50 adults were treated with garlic tablets. Cholesterol levels were measured before and after treatment. The changes in their...
In a study to assess the effectiveness of garlic for lowering cholesterol, 50 adults were treated with garlic tablets. Cholesterol levels were measured before and after treatment. The changes in their LDL cholesterol (in mg/dL) have a mean of 8 and a standard deviation of 4. (a) Construct a 95% interval estimate of the mean change in LDL cholesterol after the garlic tablet treatment. (Round the lower bound and upper bound of the confidence interval to two decimal places) Include...
A study was conducted at an American medical center and heart-attack incidents. A random sample of 30 heart-attack patients had their cholesterol levels measured two days after the attack. In add...
A study was conducted at an American medical center and heart-attack incidents. A random sample of 30 heart-attack patients had their cholesterol levels measured two days after the attack. In addition, cholesterol levels were measured for a control group of 30 people who had not had a heart attack. The unitsf cholesterol measurement are mg/dL of blood. The two data sets are below regarding blood cholesterol levels DATA SET 1: HEART ATTACK GROUP (Assume that σ=46.63). 270 236 210 142...
A new drug to treat high cholesterol is being tested by pharmaceutical company. The cholesterol levels...
A new drug to treat high cholesterol is being tested by pharmaceutical company. The cholesterol levels for 18 patients were recorded before administering the drug and after. The mean difference in total cholesterol levels (after - before) was -8.603 mg/dL with a standard deviation of 5.449 mg/dL. When creating a 90% confidence interval for the true average difference in cholesterol levels by the drug, what is the margin of error? 1) 1.7087 2) 2.2271 3) 2.2342 4) 1.2843 5) 2.1127...
20. A medical center conducted a study to investigate cholesterol levels in people who have had heart attacks. A random sample of 16 people was obtained from the names of all patients of the medical center who had a heart attack in the previous year. Of the people in the sample, the mean cholesterol level was 264.70 milligrams per deciliter (mg/dL) with standard deviation 42.12 mg/dL. Assuming all conditions for inference were met, whic of the following is a 90...
The last answer is incorrect so it's between a, b, or c
Cholesterol levels of 16 patients were taken following heart attacks at a major northeastern medical center. Cholesterol levels (mg/dL) were measured 2 days after the heart attack, and again on the same patients 14 days after the heart attack. Assume that the differences are normally distributed and that we can regard the sample as a simple random sample from the population. Based on the statistics provided below, what...
A study was conducted at an American medical center and heart-attack incidents. A random sample of 30 heart-attack patients had their cholesterol levels measured two days after the attack. In addition, cholesterol levels were measured for a control group of 30 people who had not had a heart attack. The unitsf cholesterol measurement are mg/dL of blood. The two data sets are below regarding blood cholesterol levels DATA SET 1: HEART ATTACK GROUP (Assume that σ=46.63). 270 236 210 142...
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