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. If we want to determine a 95% confidence interval for the average hourly income, the value of "t" statistics is
A)1.96
B)1.64
C)1.28
D)1.993

Question

Quizplus · Accepted Answer

For a 95% confidence interval with a sample size of 75, we use the t-distribution. With 74 degrees of freedom (n-1), the t-value is approximately 1.993.

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