Question: Two ideas for estimating this effect. One: Compare average crime in neighborhood A to average crime in neighborhood B after the streetlights were installed. Two:

Two ideas for estimating this effect. One: Compare average crime in neighborhood A to average crime in neighborhood B after the streetlights were installed. Two: compare average crime in A after the streetlights were installed to average crime in neighborhoodAto before the streetlights were installed. Why are these comparisons problematic? You need to provide one reason for each comparison. (5 points)

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