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Question
Independent random samples of Company W employees were taken to compare salaries between college graduates and high school graduates. Samples of size 30 were taken for each group. The results follow.| Salary HS ($1000) | Salary College ($1000) | ||||
| 24.1 | 22.9 | 24.0 | 32.4 | 33.1 | 26.2 |
| 21.2 | 19.9 | 23.9 | 30.9 | 29.6 | 28.7 |
| 25.7 | 19.5 | 29.0 | 39.2 | 32.1 | 31.8 |
| 28.8 | 22.1 | 24.7 | 29.6 | 30.4 | 28.5 |
| 28.6 | 22.7 | 24.4 | 35.5 | 30.4 | 32.7 |
| 30.2 | 18.6 | 23.5 | 32.0 | 31.3 | 28.6 |
| 18.4 | 23.3 | 30.9 | 32.0 | 33.3 | 33.5 |
| 24.3 | 23.8 | 27.6 | 28.3 | 37.5 | 41.4 |
| 28.3 | 25.4 | 32.1 | 30.8 | 35.4 | 28.4 |
| 21.7 | 23.9 | 23.0 | 31.2 | 37.2 | 27.2 |
Use Excel to estimate the difference in average salaries between the two groups with a 95% level of confidence.
Answer
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