In order to estimate the difference between the average hourly wages of employees of two branches of a department store, the following data have been gathered.
Downtown Store
North Mall Store
Sample size25
20
Sample mean$9
$8
Sample standard deviation$2
$1
?
A 95% interval estimate for the difference between the two population means is
A. .071 to 1.929.
B. .226 to 1.774.
C. 1.09 to 4.078.
D. 1.078 to 2.922.
Answer: A
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