1)

In baseball, the batting average is the ratio of a player's hits to at-bats. An analyst examines a baseball team's batting average and the number of games won over a season. What is the predictor variable?

Batting average

Games won

2)

A researcher claims that a country's electricity consumption is higher given a greater gross domestic product (GDP). What is the predictor variable?

Electricity consumption

GDP

3)

Consider predicting a car's fuel efficiency in miles per gallon from the car's engine size. What is the response variable?

Fuel efficiency

Engine size

4)

A restaurant owner wishes to model the relationship between mean daily costs and the number of customers served, to help manage future costs. What is the response variable?

Daily costs

Customers served