S353_Quiz 2_Oct 8_solution.pdf - STAT 353 QUIZ 2 SOLUTION...

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STAT 353 QUIZ 2 SOLUTION 2:50 pm–3:20 pm, October 8, 2020 Instructions: This is a closed book quiz. A Sharp EL-510-series calculator is permitted, no other material are allowed. To complete this quiz: [1] write your solution on paper first; show some work, a numerical answer alone is insufficient; [2] scan the paper into a PDF file; if you have two or more pages, be sure to scan them all into a single PDF file; [3] go to Brightspace Assignments Quiz 1 to submit your PDF file. Make sure the file is readable before submission. Unreadable files will get a score of zero. Problem 1. [6 marks] To study the impact of video gaming on academic performance, 20 students from a statistics course were randomly selected to write a test. Their test scores y and the average amount of time they each spent on playing video games per day x were recoded. Fitting a simple linear regression model to the data using command “fit = lm( y x )” in R yields the following output: > summary(fit) Call: lm(formula = y ~ x) Coefficients:

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