Two separate afterschool programs for at risk teenagers have been implemented in the city of Redland. One is a big brother/big sister mentoring program in which adult volunteers are paired with troubled teenagers. The second involves extracurricular team sports competitions. In terms of the percentage reduction in crimes reported to the police over a one-year period, were the programs successful? The results are for random samples of 18 neighborhoods drawn from the entire city.

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MentoringCompetition tion Program No Program -10 -20 +10 +20 +70 +10 -21 -15 -80 -10 -50 -10 +30 -10 +14 +80 +50 -20