What is your 95% confidence interval?
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: [-9.12, 1.12]
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