In Order to Estimate the Difference Between the Average Hourly

Multiple Choice

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. $\begin{array}{lll}& \text { Downtown Store } & \text { North Mall Store } \\ \text { Sample size } & 25 & 20 \\\text { Sample mean }& \$ 9 & \$ 8 \\\text { Sample standard deviation } & \$ 2 & \$ 1\end{array}$ 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.