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The Fast N' Hot food chain wants to test if their Buy One, Get One Free program increases customer traffic enough to support the cost

The Fast N' Hot food chain wants to test if their "Buy One, Get One Free" program increases customer traffic enough to support the cost of the program. For each of 15 stores, one day is selected at random to record customer traffic with the program in effect, and one day is selected at random to record customer traffic with program not in effect. The results of the experiment are documented in DATA. For each store, compute difference = traffic with program minus traffic without program. At = 0.05, test the hypothesis that the mean difference is at most 0 (at best the program makes no difference, or worse it decreases traffic) against the alternative that the mean difference > 0 (the program increases traffic).

Customer Traffic
With Program Without Program
149 140
225 233
112 110
52 42
336 332
146 135
143 151
35 33
185 178
147 147
167 162
249 243
161 149
44 48
347 346

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