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In order to estimate the difference between the average hourly wages of employees of two branches...

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 size 25 20
Sample mean $9 $8
Sample standard deviation $2 $1

A 95% interval estimate for the difference between the two population means is

1.09 to 4.08

0.07 to 1.9

1.08 to 2.92

1.9 to 2.08

Math   Statistics-And-Probability   
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Answer #1

from above 95% confidence interval = 0.07 to 1.9

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