In 1999, 4,860 TANF recipients were asked how many hours they worked in the previous week. In 2000, 4,392 of these recipients were again subject to the same TANF rules and were again asked their hours of work during the previous week. The remaining 468 individuals were randomly assigned to a "Negative Income Tax" (NIT) experiment which gave out financial incentives for welfare recipients to work and were subject to its rules. Like the other group, they were asked about their hours of work during the previous week. The data from the experiment are contained in the table below.

(a) What effect did the NIT experiment have on the employment rate of public assistance recipients? Develop a standard difference-in-differences table to support your answer.
(b) What effect did the NIT experiment have on the weekly hours worked of public assistance recipients who worked positive hours during the survey week? Develop a standard difference-in-differences table to support your answer.

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Number of Recipients Who Total Hours Of Total Number Worked At Some Work By All Of Recipients Survey Week Time in te Recipients in the Survey Week 1999 2000 99 2000 1,217 1,568 15,578 20,698 131 1,348 1,781 17,216 23,233 TANF 4,392 NIT 48 Total 4,860 213 1,638 2,535