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

Business

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