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

0.07 to 1.9

Step-by-step explanation:

Let and be the population mean of hourly wages of employees of two branches of a department store (Downtown Store and  North Mall Store)

As per given , we have

Degree of freedom :

Critical value for 95% confidence interval :

Then, 95% interval estimate for the difference between the two population means will be

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

i.e. 0.07 to 1.9

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step-by-step explanation:

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