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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 7.7 pounds with a standard deviation of 4.4 pounds, and the mean weight loss for Group 2 was 14.4 pounds, with a standard deviation of 5.8 pounds. Calculate the upper bound of a 99% confidence interval for the difference in mean weight loss for the two groups, assuming the two population standard deviations are equal.
A pie chart shows the market shares of cola products. The "slice" for Pepsi-Cola has a central angle of 90 degrees. What is its market share.
given two samples a and b with population size of a 30 sample variance of a 45.3 and a population size of b 25 sample
consider you estimate the following regression model y alpha betax uwhere y is the dependent variable x is the
below are two groupsa 15 22 19 25 16b 32 25 27 33 21 35 30a test to see if the variances are the same give the null and
A study was done on the accuracy of advertisements by the five types of electronics stores in a city. On each of the six days, items were randomly selected from the advertisements for each type of store and the actual price was compared to the adv..
Do these simulated data provide evidence for us to conclude that a difference in the spinal canal cross sectional area exist between the population of subjects with disc hernination and a population of those who do not have disc hernation?
Can we conclude that car size is dependent on marital status? YES or NO (circle one)
School seniors in his random sample, 159 believe that "getting rich" is an important goal. Can he conclude, at the 0.05 level of significance, that the proportion has indeed changed?
a mineral economist estimated that a particular mining venture had probability 0.4 of a 30 million loss probability 0.5
a brand of television has a lifetime that is normally distributed with a mean of 7 years and a standard deviation of
express each of the following extended sums in the appropriate summation
annual per capita consumption of milk is 21.6 gallons statistical abstract of the united states 2006 being from the
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