Exhibit 10-7 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	25	20
Sample mean	$9	$8
Sample standard deviation	$2	$1

Refer to Exhibit 10-7. A point estimate for the difference between the two sample means (Downtown Store - North Mall Store) is _____.

Group of answer choices

2

3

4

1