A Recent Survey Indicated That the Average Amount Spent for Breakfast

Multiple Choice

A recent survey indicated that the average amount spent for breakfast by business managers was $\$ 7.58$ with a standard deviation of $\$ 0.42$ . It was felt that breakfasts on the West Coast were higher than $\$ 7.58$ . A sample of 81 business managers on the West Coast had an average breakfast cost of $\$ 7.65$ . At $\alpha = 0.05$ , what is the critical value?

A) -1.5
B) 1.65
C) 1.5
D) 1.96