two sample t-test for independent samples. 1. 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