What is the null and research hypothesis?
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: Null: There is no difference in the number of apprehensions between the old security system and the new security system.
Research: There is a difference in the number of apprehensions between the old security system and the new security system (nondirectional).
The new security system yields more apprehensions than the old security system (directional).
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