What do you conclude? Is there a difference between the old and new security systems? Write your result in APA style.
The owner of a chain of five retail stores wishes to compare the number of shoplifter apprehensions in her stores for a 1-month period prior to the installation of a new security system to the number of apprehensions in the same stores for a 1-month period after the security system was in place. The new system is much more expensive than the old system, and she doesn’t want to spend the extra money unless the new security system is better than the old system. The apprehension data are as follows:
Ans: A paired samples t test suggested that there is no difference between the number of apprehensions using the old security system (M = 21.0, SD = 2.92) and the new security system (M = 25.0, SD = 3.32), t(4) = -2.17, p > .05, d = -0.97, 95% CI [-9.12, 1.12]. Therefore, it does not appear to be worth investing in the new security system.
Note: If the student used a directional research hypothesis, then with a critical value of 2.132, we would reject the null hypothesis and conclude that it is worth investing in the new security system.
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