[Solution] In the table below the average service time (in seconds) is reported from a survey among quick-service restaurants: Chain Taco Bell 308 158.03
Question: In the table below the average service time (in seconds) is reported from a survey among quick-service restaurants:
| Chain | |||
| Taco Bell | 308 | 158.03 | 33.8 |
| McDonald’s | 317 | 189.49 | 41.3 |
- Is there a difference in the average service time between these two chains? Test the null hypothesis that the chains’ average service time is the same against the two-sided alternative. Use a significance level of 0.05.
- Construct a 95% confidence interval for the difference in average service time.
- Summarize your analysis of these data in a short paragraph.
Deliverable: Word Document 
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