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Studies have shown that the risk of developing coronary disease increases with the level of obesity. A study comparing two methods of losing weight: diet alone and exercise alone were conducted on 82 men over 1-year period. Forty-two men dieted and lost an average of 16.0 lb over the year, with a standard deviation of 5.6 lb. Forty-?ve men who exercised lost an average of 10.6 lb, with a standard deviation of 7.9 lb. Construct a 99% con?dence interval for the difference in the mean weight loss by these two methods. State any assumptions you made and interpret the result you obtained.
Assume a very large normally distributed population of scores on a test with mean 77 and standard deviation 7.
find the probability of correctly answering the first 2 questions on a multiple choice test if random guesses are made
Do you view a chocolate bar as delicious or as fattening? Your attitude may depend on your gender. In a study of American college students, Rozin, Bauer and Catanese (2003) examined the importance of food as a source of pleasure versus concerns ab..
a goodness-of-fit test is a nonparametric test involving a set of observed frequencies and a corresponding set of
before the days of high security at airports there was a legendary person who was afraid of traveling by plane because
A random sample of 85 group leaders and supervisors revealed that they worked an average of 6.5 years before being promoted. The population standard deviation was 1.7 years. Using the 0.95 degree of confidence, what is the confidence interval for ..
You are the owner of a small casino in Las Vegas. You want to reward high rollers who come to your casino. You want to give free accomodations to no more than 10% of your patrons. Suppose that the mean amount wagered by all patrons is $287 with a ..
State the null and alternative hypotheses using proper Statistical Notation
Recurrence is defined as the reappearance of a metastasis in exactly the same site, or in the case of patients whose tumor never completely disappeared, enlargement of the original lesion. Times to recurrence (in weeks) for the 23 patients were: 2..
the accompanying diagram depicts a five step worker-paced headphone manufacturing plant. the headphones are meant to be
What is the correlation coefficient & how strong is it
a rug manufacturer has decided to use 7 compatible colors in her rugs. however in weaving a rug only 5 spindles can be
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