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 dinners decreased while the free dessert offer was in effect? Use the a = 0.05 level of significance and the P-value method with the TI-84 Plus calculator.

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