Chapter 4, Problem 42SE

Choosing the Predictor and the Response Variable Indicate which variable you think should be the predictor $\left(x\right)$ and which variable should be the response $\left(y\right)$. Explain your choices.

a. A researcher measures subjects’ stress levels and blood pressures.

b. Workers who commute by car record the length of their commutes (in miles) and the amount spent monthly on gasoline purchases.

c. Amusement parks record the heights and maximum speeds of roller coasters.