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As the director of the local Boys & Girls Club, you have claimed for years that membership in your club reduces juvenile delinquency. A cynical member of your funding agency has demanded proof of your claim. Fortunately, your local sociology department is on your side and springs to your aid with student assistants, computers, and hand calculators at the ready. Random samples of members and nonmembers are gathered and interviewed with respect to their involvement in delinquent activities. Each respondent is asked to enumerate the number of delinquent acts he has engaged in over the past year. The results are in and reported here (the average number of admitted acts of delinquency). What can you tell the funding agency?
The users are then timed in their ability to setup and program the DVD by performing a series of operations. Which statistical analysis technique should be used? What is the null hypothesis? Can the market researcher get an answer? Why or why not?
Computing a linear regression equation to predict the future values of the dependent variable Y - Linear relationships into a single multiple regression.
Suppose two measurements, Y1 and Y2, corresponding to different treatments, are taken on the same individual who has been randomly sampled from a population.
construct a 95 prediction interval for y given x -3.5 the regression equation y 2.097x0.552 and the standard error of
The pie chart summarizes the genres of 120 first-run movies released in 2005.- Is this an appropriate display for the genres? Why/why not?- Which genre was least common?
weights were measured for 5 female and 5 male beetle pupae. test the hypothesis of no difference in mean weight of
Advertisers need to know which age groups are likely to see their ads. Purchasers of 120 copies of Cosmopolitan are shown by age group Perform the chi-square test for a uniform distribution at α = .01
In StaTScan what is the difference between a spatial cluster size to 25% of the population risk and one with 50% window ? In StaTScan what is the difference between space-time permutation and space-time?
For every additional hour spent studying for the exam you would expect a grade improvement of 60.2 points
Nintendo Sony would like to test the hypothesis that a difference exists in the average age of users of a Wii, a PlayStation, or an Xbox console game. The following data represent the age of a random sample of Wii, PlayStation, and Xbox users.
1. Obtain the test-statistic and p-value. Report the test-statistic with degrees of freedom and the p-value here. 2. Report and interpret a 95% confidence interval for the difference in the mean time to complete the maze between those in the presen..
The ABC corporation claims that its new gasoline additive for passenger cars. Find a 95% confidence interval for the difference in the means of these two data sets.
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