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Treating Chronic Fatigue Syndrome Patients with chronic fatigue syndrome were tested, then retested after being treated with fluorocortisone. Listed below are the changes in fatigue after the treatment (based on data from "The Relationship Between Neurally Mediated Hypertension and the Chronic Fatigue Syndrome" by Boi Holaigah, Rowe, Kan, and Calkins, Journal of the American Medical Association Vol. 274, No. 12). A standard scale from -7 to +7 was used, with positive values rep resenting improvements. Use a 0.01 significance level to test the claim that the mean change is positive. Does the treatment appear to be effective?
6 5 0 5 6 7 3 3 2 6 5 5 0 6 3 4 3 7 0 4 4
The U.S. Food and Drug Administration (FDA) performed a study that compared the carbohydrate content (as a percentage of weight) of several major brands of corn and potato chips.
One box contains five red and six black marbles. A second box contains 10 red and five black marbles. One marble is drawn from box 1 and placed in box 2.
In a normal distribution of 1,000 aptitude test scores, with a mean of 60 and a standard deviation of 8, how many scores fall:
The employees of a company were surveyed on questions regarding their educational background and marital status. Of the 600 employees
Make up a scatter diagram with 10 dots for each of the following:
At significance levels of .05 and .01 test H 0 : the factors A and B are independent.
A monthly budget of $100,000 is available for both advertising and purchase of the fragrances. Develop and solve a linear optimization model to determine how much of each type of perfume should be produced to maximize the net profit.
Must you assume that the population amount of paint per can is normally distributed here? Explain
Charmers' Candy Store sells wrapped hard candies in the following flavors: strawberry, blueberry, lemon, lime, and orange. They advertise that there are equal proportions of each flavor in every size of their candy boxes.
On a test with a population mean of 75 and standard deviation equal to 16, if the scores are normally distributed, what percentage of scores fall below a score of 83.8?
What is dispersion? Briefly name five measures of dispersion. Describe the characteristics of the standard deviation. Explain
For a population with a mean of (u)=50 and a standard deviation of (o)=10, how much error on average would you expect between the sample mean (M) and the population mean for the following samples
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