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Question
At a particular airport in the United States, independent samples of domestic flights from two airlines were taken and the amount of time each flight was delayed was measured. The results follow.| Minutes Delayed Airline A | Minutes Delayed Airline B | ||
| 0.0 | 33.7 | 0.0 | 7.2 |
| 25.6 | 31.8 | 0.0 | 34.6 |
| 38.9 | 36.2 | 0.0 | 41.6 |
| 27.3 | 24.7 | 34.8 | 43.1 |
| 44.5 | 0.0 | 38.9 | 39.4 |
| 41.8 | 41.5 | 42.1 | 7.8 |
| 35.3 | 23.5 | 39.5 | 12.8 |
| 34.5 | 38.1 | 35.7 | 33.0 |
| 29.0 | 32.9 | 41.3 | 31.8 |
Use Excel to estimate the difference in average delay time between the two airlines with a 95% level of confidence.
Answer
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