Earning power A college's job placement office collected date about students' GPAs and the salaries they earned in their first jobs after graduation. The mean GPA was 2.9 with a standard deviation of 0.5. starting salaries had a mean of $46,200 with a SD of $6000. the correlation between the two variables was r = 0.86. the association appeared to be linear in the scatterplot. (show your work).
a. write an equation of the model that can predict salary based on GPA.
b. Do you think these predictions will be reliable? Use the correlation to explain
c. Your brother just graduated from that college with a GPA of 3.30. He tells you that based on this model the residual for his pay is -$1830. What salary is he earning?
d. Interpret the slope of your model in context