Do police officers who scored well on an aptitude test make better police officers? Use the following crosstabulation to do a chi-square test, and also calculate Gamma.  What do the results tell us about the ability of the test to predict successful policing?       Officer Aptitude Test Scores   Officer Effectiveness Rating   Low   Medium   High   Totals   Low   12   6   7   25   Moderate   9   11   9   29   High   5   9   10   24   Totals   26 26 26 78

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