A Nutrition Study Measured How Many Helpings of Vegetables Each

Multiple Choice

A nutrition study measured how many helpings of vegetables each of 125 grade school children were served each week during a school year and their body mass index (BMI) scores. Which variable would one put on the horizontal axis of a scatterplot of the data?

A) One would put the BMI score because it is the response variable.
B) One would put the BMI score because it is the explanatory variable.
C) One would put helpings of vegetables because it is the response variable.
D) One would put helpings of vegetables because it is the explanatory variable.
E) It makes no difference because there is no explanatory-response distinction in this study.