I am interested in evaluating how stop signs affect car crashes.  I collect data from a few intersections before and after I put in a stop sign.  Note, the vertical bar denotes before and after for each intersection. 10 | 10 2 | 3 3 | 2 5 | 3 8 | 6 4 | 4 What is my test statistic?  Round to two decimal places.

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