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 neighborhood A to 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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