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Is the Diet Practical? When 40 people used the Weight Watcher diet for one year, their mean weight loss was 3.0lb and the standard deviation was 4.9 lb (based on data from "Comparison of the Atkins, Ornish, Weight Watcher, and Zone Diets for Weight Loss and Heart Disease Reduction, "by Dansinger, et. al, Journal of the American Medical Association, Vol. 293, No. 1). Use a 0.01 significance level to test the claim that the mean weight loss is greater than 0 lb.
the u.s. bureau of labor statistics publishes data on the benefits offered by small companies to their employees. only
Bob gets tests grades of 86, 92, and 60 He gets an 90 on his final exam. Find the weighted mean if each tests counts for 20%, and the final exam counts for 40% of the final grade.
If she has chosen the first weeks rides, how many ways can she choose four more different rides for the second week? Assume that order does not matter.
you toss a fair coin 400 times. us- ing the normal approximation find the approximate probability of getting1 exactly
In Dallas some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 143, 348 runs and had 20 accidents, while the fleet of yellow firetrucks made 135,035 runs and had 4..
an article in a medical journal found that percutaneous nephrolithotomy pn had a success rate in removing kidney stones
a real estate agent has appointments with eight prospective clients. from past experience the agent knows that the
The samples do indicate that university A's students are younger than university B's; but is the difference significant at the 1% level?
Test whether the mean weight is greater than 16 ounces with P-value approach.
1. explain why stepwise regression is necessary when there are many predictor variables.2. explain the main difference
A major issue facing many states is whether to legalize casino gambling. Suppose the govenor of one state believes that more than 55% of the state's registered voters would favor some form of legal casino gambling.
In addition, the average daily balances have been found to be normally distributed (Gaussian). What percentage of personal checking account customers carry average daily balances in excess of $800?
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