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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.
find the standardized test statistics t for a sample with n 12 sample mean 19.2 s 2.2 and a 0.01 if h0 u 18 round
Suppose that a researcher does a study to see how level of anxiety (A 1 = low, A 2 = medium, A 3 = high) is used to predict exam performance (Y).
What is the probability that of today's 1,000 callers at least 5 received a busy signal? Use the poisson approximation to the binomial. (Round your answer to 4 decimal places.)
the centers for disease control and prevention reported a survey of randomly selected americans age 65 and older which
The mean of a set of 7 numbers is 13. What is the sum of the numbers? Find the mode of the following test scores: 89, 78, 91, 82, 75, 89, 84, 95, 89, 93
the grocery manufacturers of america reported that 76 of consumers read the ingredients listed on a products label.
ph in the water is 7 at the .05 significance level. Her alternative hypothesis is that the water does not have a pH of 7. For which p-value will she fail to reject the null hypothesis?
a manufacturer receives parts from two suppliers. a simple random sample of 400 parts from supplier 1 finds 20
a researcher comuted the f ratio for a four-group experiement. the computed f is 4.86. the degrees of freedom are 3 for
suppose that x and y are independent random variables each coming from a geometric distribution with parameter p.a.
Length of smoking time was recorded for each. Mean was =140 hours. Suppose = 8 hours. Determine 95% confidence interval for mean amount of time grocery-store ham is smoked.
Finding the probability of a pointer to land in a color among given three colors.
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