Criminal Justice Statistics
- Your city has recently decided to reduce policing costs by switching from one officer cars to two officer cars. The police chief has commissioned you to test whether policing costs have decreased in response to the switch to two officer cars for all four districts. Test whether there is a significant difference in the average police costs between one officer and two officer cars at the .05 level. Make sure you apply the nine steps of this hypothesis test!
| |
Before |
After |
| District 1 |
$67,000 |
$64,000 |
| District 2 |
$72,000 |
$73,125 |
| District 3 |
$40,000 |
$39,000 |
| District 4 |
$61,000 |
$58,000 |
- You have administered a survey to a group of your college peers. You believe that going out to bars is associated with higher average levels of victimization. You find that those who go out to bars (n = 86) report, on average, 4.2 victimizations, with a standard deviation of 6.7. Those who do not go out to bars (n = 31) report, on average, 2.8 victimizations, with a standard deviation of 1.1. Test whether there is a significant difference in the average level of victimizations between bar patrons and those who do not go to bars at the .05 level. Make sure you use all eight steps of hypothesis testing! Also, make sure that you include the substantive interpretation at the end—interpret the results in bivariate terms.
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