Data set: Games1
a. Create a normal probability plot and histogram of the residuals from the Games1 data (Question 26) and comment on the normality assumption for the random error term.
b. Create a normal probability plot or a histogram of the observed responses (completion times yi, where i = 1, 2, … , n) from the computer game study.
c. Explain why residuals should be used instead of the observed responses to test the normality assumption.