3 The following sample information is given concerning the ACT scores of high

3 the following sample information is given

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3. The following sample information is given concerning the ACT scores of high school seniors form two local schools. School A School B 1 n = 14 2 n = 15 1 x = 25 2 x = 23 2 1 = 16 2 2 = 10 Develop a 95% confidence interval estimate for the difference between the two populations.
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4. A poll was taken this year asking college students if they considered themselves overweight. A similar poll was taken five ago. Results are summarized below. Use a hypothesis test to test if the proportion has increased significantly? Let = 0.05. Sample Size Number Considered Themselves Overweight Current Sample (c) 300 150 Previous Sample (p) 275 121
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5. To catch more criminals, the governor has budgeted more money to put more police on our city streets. The decision was based on the following data: # of Police: 13 15 23 25 15 10 9 20 # Arrests: 8 9 12 18 8 6 5 10 a. Make a scatter diagram of this information and comment on the relationship. b. Calculate the line of best fit. Be sure to show all work. c. If you had 8 police on patrol how many criminals would you expect to be caught?
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  • Spring '13
  • Tyler

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