In order to determine whether or not there is a significant difference between the mean hourly wages paid by two companies (of the same industry), the following data have been accumulated.
Company A
Company B
Sample size80
65
Sample mean$16.75
$16.25
Population standard deviation$1.00
$.95
?
The p-value is
A. .0010.
B. .0021.
C. .0042.
D. .9990.
Answer: B
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