Question: A retail store uses a screening test to discover sales potential in job applicants. After one year on the job, the gross sales of 20 sales personnel are tabulated along with their test scores as shown (in part) below.

a. [5 points] Create a regression model of predicted sales vs. test score. Hint: consider the quadratic term, (test score)^2 in your model.

b. [5 points] What is the value of R²?

c. [5 points] Are there any standardized residuals >½2½?

d. [5 points] What is the predicted gross sales volume for a test score = 95?