A doctor wishes to determine the relationship between a male's age and that male's total cholesterol level. he tests 200 males and records each male's age and that male's total cholesterol level. the male's cholesterol level is the predictor variable.

This is a false statement.

A predictor variable, sometimes called as independent or explanatory variable, is a variable which is often manipulated by the experimenter and most of the time represent the reasons for the observed variation in the sample studied. In our case, the age of the males is the predictor variable.

The male's cholesterol level is the response variable, or also called dependent variable, since it probably depends on the age of the participants.