A sample of 75 information systems managers had an average hourly income of $40.75 with a standard deviation of $7.00.If we want to determine a 95% confidence interval for the average hourly income of the population, the value of t is
A) 1.96.
B) 1.645.
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.

A Sample of 75 Information Systems Managers Had an Average