Jobs and productivity! How do retail stores rate? One way to answer this question is to examine annual profits per employee. The following data give annual profits per employee (in units of one thousand dollars per employee) for companies in retail sales. Assume σ ≈ 3.5 thousand dollars.
| 3.7 | 6.6 | 4.3 | 8.0 | 7.6 | 5.3 | 8.4 | 5.7 | 2.6 | 2.9 | 8.1 | −1.9 |
| 11.9 | 8.2 | 6.4 | 4.7 | 5.5 | 4.8 | 3.0 | 4.3 | −6.0 | 1.5 | 2.9 | 4.8 |
| −1.7 | 9.4 | 5.5 | 5.8 | 4.7 | 6.2 | 15.0 | 4.1 | 3.7 | 5.1 | 4.2 |
| lower limit | thousand dollars |
| upper limit | thousand dollars |
| lower limit | thousand dollars |
| upper limit | thousand dollars |
