Question: A restaurant tried to increase business on Monday nights, traditionally the slowest night of the week, by featuring a special $1.00 "Oh, Go Ahead!" dessert menu. The number of diners on each of 12 Mondays was recorded while the special menu was in effect. The data were:

119 139 112 126 121 128 108 63 118 105 131 142

1. Calculate a 95% confidence interval
2. Knowing that the average diners per Monday night before the "Oh, Go Ahead!" promotion was 118.3. Just from looking at the interval, can the management conclude that the promotion was successful? Explain your answer.

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