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Researchers studied the effects of adding an exercise program to dieting in the achievement of weight loss. A sample of 14 men ages 18-20 (Group 1) were observed for weight loss using a diet only, and another independent sample of 15 men ages 18-20 (Group 2) were put on the same diet, but with an added exercise program. The mean weight loss for Group 1 was 5.9 pounds with a standard deviation of 4 pounds, and the mean weight loss for Group 2 was 13.6 pounds, with a standard deviation of 3.7 pounds.
Calculate the test statistic for a test of the hypothesis that the mean weight loss for the two groups is the same. Give your answer to two decimal places.
consider two random variables x and y. suppose that the variance of x is 20 that this of y is 10 and that the
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you have three pieces of string with lengths of 42 inches 63 inches and 77 inches. you need to cut pieces of equal
A standard deviation of 20. If the seller wishes to have adequate stock 95% of the time, how many of the games must she keep on hand.
"Do you believe that gun control laws which restrict the ability of Americans to protect their families should be eliminated?"
Compare and contrast the similarities and differences between the two scores and explain when and why you would use each.
The z-score of 1.33 tells you that Eric's time to get to work is 1.33 standard deviations from the mean.
it is desired to estimate the mean ldl level of healthy males in the state of ohio at the 99 confidence level to within
The five year surival rate for Caucasians for all forms increased from 37% in 1960 to 58% now. Express this change in two ways (1) as an absolute difference in terms of percentage points and (2) as a relative difference in terms of percent.
The analysis needs to be re-run adding the error into the regression sum of squares.
the average flight from point a to point b takes 100 minutes with a standard deviation of 10 minutes.a. what is the
bobs sporting goods believes the average age of its customers is 40 or less. a random sample of 60 customers was
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