I. Refer to the Grade Point Average problem from homeworks I and 2. The command >mydata

the Grade Yomt Average problem trom homeworks 1 d Z 'Ihe command > mydata read. table(file=http:///YAN.stat.unm.edu/storlie/st540/hw3_data.txt", header=TRUE) will read the data into an R data frame. Note there are two additional variables included in this data set that did not appear in HW 1 or HW2. (a) Fit the simple linear regression model with GPA as the response and entrance test score as the predictor. Evaluate the linear relationship assumption. Which diagnostic plot(s) is appropriate for this? Create this plot(s) and comment. (b) Create a diagnostic plot(s) to evaluate the normality assumption. Comment. (c) Create a plot(s) to assess the equal variance assumption. Comment.