Free dessert: In an attempt to increase business on Monday nights, a restaurant offers a free dessert with every dinner order. Before the offer, the mean number of dinner customers on Monday was  150 . Following are the numbers of diners on a random sample of  12  days while the offer was in effect. Can you conclude that the mean number of diners decreased while the free dessert offer was in effect? Use the  =α0.10  level of significance and the  P -value method with the TI-84 Plus calculator. 178 141 158 124 184 111 114 113 136 192 164 115     (a) State the appropriate null and alternate hypotheses.

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