Exhibit 10-7
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 |
Refer to Exhibit 10-7. A point estimate for the difference between the two sample means is
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