Question: In order to estimate the difference between the average hourly wages of employees of two branches of a department store, two independent random samples were

In order to estimate the difference between the average hourly wages of employees of two branches of a department store, two independent random samples were selected and the following statistics were calculated.

Downtown Store North Mall Store
Sample size 36 30
Sample mean $11 $9
Sample standard deviation $4 $2

A 95% interval estimate for the difference between the two population means (Downtown Store - North Mall Store) is _____.

a. $1.24 to $2.76
b. $0.73 to $3.27
c. $0.48 to $3.52
d. $0.51 to $3.49

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