The average salary for 30 top NFL quarterbacks in 2017 was just over $13,000,000. A linear model to predict Salary from Total QBR (an overall measure of performance based on game statistics) found the following:

a) What is the explanatory variable?

b) What is the response variable?

c) What does the slope mean in this context?

d) What does the y-intercept mean in this context? Is it meaningful?

e) What do you predict the Salary for a quarterback with a

Total QBR of 60 points to be?

f) Tom Brady of the New England Patriots had a Total QBR of 83 and was paid $14,000,000 in 2016. What was his residual?

g) According to the model, was Brady over- or underpaid for the 2016 season? Explain.

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Salary = 140,638.52 + 216,373.28 *Total QBR.