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.
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
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