Indicate which variable you think should be the predictor (x) and which variable should be the response (y). Explain your choices.

a. You collect data on the number of gallons of gas it takes to fill up the tank after driving a certain number of miles. You wish to know how many miles you’ve driven based on the number of gallons it took to fill up the tank.

b. Data on salaries and years of experience at a two-year college are used in a lawsuit to determine whether a faculty member is being paid the correct amount for her years of experience.

c. You wish to buy a belt for a friend and know only his weight. You have data on the weight and waist sizes for a large sample of adult men.