Math 10 Morriss Commute Time _ __________________________ Pre - COVID, stat s students investigated commute times to campus among students and employees . S ome of their data: 1. What popula tion parameter did the students investigate? In which populations ? 2 . Does one group appear to have commute for a longer time, on average? I f so, which one? Either way, how did you decide? 3. Construct 95% confidence intervals for the mean commute time in each population. 4 . Interpret each confidence interval with a sentence th at begins , "I'm 95% sure that..." 5. Why is the confidence interval for mean commute time so much wider for employees? 6 . Would 90% confidence intervals be wider or narrower? Explain. 7 . Notice that the confidence intervals ove rlap. C omment on the implications for any statistica l conclusions we mi ght make about mean commute times . _ __________________________________ Population Students Employees number of respondents 70 21 mean commute time (minutes) 23.7 16.2 standard deviation (minutes) 14.9 15.0

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