After a store installed security cameras, thefts there fell by 30 percent, and the manager concluded that the cameras caused the fall.
Which one of the following, if true, most strengthens the manager's conclusion?
Answer and explanation
Correct answer: C. At a branch without cameras, thefts stayed the same over the same period
- Step 1: A comparison branch without cameras shows no fall. Step 2. That points to the cameras as the cause. Answer: the branch without cameras. Why not the others: these do not isolate the cameras.
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