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 Mondays while the offer was in effect. 181172153142160
156 144 152 176 172
Can you conclude that the mean number of diners increased while the offer was in effect? Use the α = 0.05 level of significance and assume the population is normally distributed.
Question 2 options:

Reject H0. There is sufficient evidence to conclude that the mean number of diners increased while the offer was in effect.

Do not reject H0. There is insufficient evidence to conclude that the mean number of diners increased while the offer was in effect.

There is not enough information to draw a conclusion.