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Researchers studied the effects of adding an exercise program to dieting in the achievement of weight loss. A sample of 45 men ages 18-20 (Group 1) were observed for weight loss using a diet only, and another independent sample of 52 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 7.1 pounds with a standard deviation of 4.7 pounds, and the mean weight loss for Group 2 was 14.7 pounds, with a standard deviation of 4.9 pounds.
Calculate the lower bound of a 90% confidence interval for the difference in mean weight loss for the two groups.
a comparison between the average jail time of bank robbers and car thieves yielded the following results in yearsn180
What fraction of the company's product is good? What percentage is blemished? If an unit of product is selected at random and found to be blemished, what is the probability that it was produced on machine B?
Use any method to decide whether to rejects or fail to reject the null hypothesis. Then interpret the decision in the context of the original claim.
Find the probability that the mean weight of those loads is less than 42.00 tons. Assume that the variable is normally distributed.
we are interested in testing whether the standard deviation of a population 1 is significantly greater than the
question a bottle cap manufacture with four machines and three operators wants to see if variation in hourly
When such digits are randomly generated, what is the distribution of those digits? Given such randomly generated digits, what is a test for "goodness-of-fit"?
How many bolts should be sampled in order to make us 95% confident that the sample mean bolt length is within .02 inches of the true mean bolt length?
a precision instrument is guaranteed to read accurately to within 2 units. a sample of four instrument readings on the
Barron’s reported that the average number of weeks an individual is unemployed is 17.5 weeks (Barron’s, February 18, 2008). Assume that for the population of all unemployed individuals the population mean length of unemployment is 17.5 weeks and that..
a chi-square goodness-of-fit test is to be performed. the relative frequencies for the null hyupothesis and the sample
according to a recent research report the average monthly household mobile phone bill is 73. suppose monthly household
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