A study was done to compare the lung capacity of coal miners to the lung capacity of farm workers. The researcher studied 200 workers of each type. Other factors that might affect lung capacity are smoking habits and exercise habits. The smoking habits of the two worker types are similar, but the coal miners generally exercise less than the farm workers
-Which of the following is the explanatory variable in this study?
A) Exercise
B) Lung capacity
C) Smoking or not
D) Occupation

Question

Quizplus · Accepted Answer

The explanatory variable is the one that is manipulated or categorized to observe its effect on the response variable. In this study, the occupation (coal miners vs. farm workers) is the explanatory variable being compared to see its effect on lung capacity.

A Study Was Done to Compare the Lung Capacity of Coal