Salary information regarding male and female employees of a large company is shown below.
Male
Female
Sample Size64
36
Sample Mean Salary (in $1000)45
41
Population Variance (
)128
72
?
At 95% confidence, the margin of error is
A. 1.960.
B. 1.645.
C. 3.920.
D. 7.839.
Answer: C
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