Auto technicians working at a shop in a rural residential area noticed that the depth of tire treads was smaller among cars that have more miles on the odometer. What are the explanatory variable and response variable for this relationship?

The explanatory variable is the factor used to explain or predict a change in another variable. Here, miles on the odometer are used to explain why tire tread depth differs: cars with more miles tend to have less tread. Therefore, the explanatory variable is miles on the car odometer, and the response variable is depth of tire tread (choice B).

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