Exhibit 8-6 A Sample of 75 Information System Managers Had an Average

Multiple Choice

Exhibit 8-6
A sample of 75 information system managers had an average hourly income of $40.75 with a standard deviation of $7.00.
-Refer to Exhibit 8-6. The 95% confidence interval for the average hourly wage of all information system managers is

A) 40.75 to 42.36
B) 39.14 to 40.75
C) 39.14 to 42.36
D) 30 to 50