Iowa has decided to run a quasi-experiment in regard to its workfare program and the program€™s impact on incentives. Officials think that workfare increases the incentives to individuals to earn more money in addition to welfare. Two hundred recipients are selected; 120 are randomly assigned to a workfare program, and 80 are assigned to a control group. By follow-up interviews, the state finds out how much outside income per week is earned by each individual, with the following results:

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Workfare $342.50 137 Control $297.30 95 Mean