find out the test statistic value for population mean.
A recent survey indicated that the average amount spent for breakfast by business managers was $7.58 with the 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. 13. At a = 0.05, what is the test value?