48 A recent survey indicated that the average 49 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 a = 0.05, what is the test value? a. 1.96 b. 1.5 C. -1.5 d. 1.64