Question: Researchers have investigated hand-washing practices in public restrooms. Here are some data from an observational study.

1. What parameter did the researchers investigate? In which populations?
2. Does one population appear to wash longer, on average? If so, which one? Either way, how did you decide?
3. Construct a 95% confidence interval for the difference in mean wash time between dirty sinks and clean sinks.
4. Interpret your confidence interval with a sentence that begins, "I'm 95% sure that..."
5. Based on this confidence interval, what conclusion can you draw about average hand washing times as related to the condition of the sink?
6. What's a good question for further investigation?
7. What sources or scholars did you find helpful?

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Deliverable: Word Document