A study of high crime locations in Miami, Florida was conducted. The number of crimes in each of eight sample areas throughout a one year period was recorded. Then the neighborhood watch program was inaugurated. The number of crimes before as well as after the watch is indicated in the table that follows. Has there been the decrease in the number of crimes since the program was inaugurated? Employ the 0.05 significance level.
Find out the test statistic. Employ matched pairs t procedure. ( this is assume to be a table below)
Number of crimes by area A B C D E F G H
Before watch 7 7 8 8 17 12 8 9
After watch 2 7 3 6 8 13 3 5
Is there enough evidence of the decrease in the number of crimes since the program was inaugurated?