A sample of 100 information systems managers had an average hourly income of $40.00 with a standard deviation of $8.00. The value of the margin of error at 95% confidence is
A) 80.
B) 8.
C) .10.
D) 1.568.

Question

Quizplus · Accepted Answer

We can use the formula: Margin of error = Critical value x Standard error
First, we need to find the critical value using a z-table or calculator. At 95% confidence level, the critical value is 1.96.
Next, we need to find the standard error using the formula: Standard error = Standard deviation / Square root of sample size
Standard error = 8 / square root of 100 = 0.8
Now we can plug in the values to find the margin of error:
Margin of error = 1.96 x 0.8 = 1.568
Therefore, the answer is D: 1.568.

A Sample of 100 Information Systems Managers Had an Average