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17. Garlic for Reducing Cholesterol In a test of the effectiveness of garlic for lowering cholesterol, 49 subjects were treated with raw garlic. 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 0.4 and a standard deviation of 21.0 (based on data from "Effect of Raw Garlic vs Commercial Garlic Supplements on Plasma Lipid Concentrations in Adults with Moderate Hypercholesterolemia," by Gardner et al., Archives of Internal Medicine, Vol. 167). Test the claim that with garlic treatment, the mean change in LDL cholesterol is greater than 0. What do the results suggest about the effectiveness of the garlic treatment?
What is the probability that at least one of the flights will be late and why the binomial model is not appropriate for finding the probability that at least one flight will be late.
A sportswear manufacturer would like to conduct a matched pairs experiment to compare two new models of running shoes to determine which is better for track and field athletes running the 1500-meter race. Twenty elite runners volunteer to part..
The average height of flowering cherry trees in a certain nursery is 10.0 feet. If the heights are normally distributed with a standard deviation of 1.2 feet, find the proportion of trees less than 12.3 feet tall.
The proportion of people aged 18-25 who currently use illicit drugs is equal to 0.20 (or 20%). Express the null hypothesis H0 and the alternative hypothesis H1 in symbolic form. Be sure to use the correct symbols - μ, p, and σ-for the indicated
Find the test statistic and do the two-sample test for equality of proportions. Is the decision close?
University Number of Students
Create the second data set by inserting eight data points all very close to 10 on the number line and record the standard deviation of this data set, and then delete that data set.
The average Monthly rent for one bedroom apartments in Chattanooga has been $700. Because of the downturn in the real estate market, it is believed that there has been a decrease in the average rental. State the null and alternative hypothesis
An attendant at a car was is paid according to the number of cars that pass through.
Design and sketch an average control chart, showing upper and lower design limits, upper and lower action limits, and nominal value. Calculate and state the range control limit value.
Given that the scores on a medical test follow a normal distribution with a mean of 460 and a standard deviation of 100. If all students in a class of 41 attend the test what is the probability that the given class will obtain a mean score of abov..
Example Study 2: Another researcher finds 4,000 men over 40 who have not had heart attacks and are willing to participate in a study. She assigns 2,000 of them into a regular program of supervised exercise. The other 2,000 continued their usual..
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