Is there a significant difference in the mean crime rate for Southern states and the mean crime rate for Nortuer.. tates? Use the riginal crime rates Is there a significant change in crime rates over the ten years between the first and second data col ections. Was there a s. guificant correlation between crime rate and police expenditures at the time of the first colection of data? To determine this perform a simple inear regression for these . ariabres including a scatterplot r r-, interpretation of r- in the context of the problem, determine if slope is significant, and state what slope indicates in the context of the problem. Was there a significant correlation between crime rate and police expenditures ten years later? I'his should be answered using the same guidelines as the previous