Stat20_Quiz1_Solutions.pdf - Stat 20 Quiz 1 Explain briefly...

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Stat 20 Quiz 1 Explain briefly to receive full credit on problem 1. 1. In our Stat 20 class, the people who said they play 0 hours of video games per week sleep an average of 7.2 hours per night. For the people that said they play more than 0 hours of video games, the average number of hours was 7.1. a) Is this data from a controlled experiment or an observational study? Explain enough to show that you know what the difference is. b) Does this mean that playing video games makes you sleep less? Explain briefly. If you say yes, explain why. If you say no, give an example of a possible confounding factor. 2. R questions The following is typed into R, you can use x in all parts below.

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