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
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
Which is the following classifications of variable types is false?
a. customer satisfactory: very unsatisfied, unsatisfied, satisfied, very satisfied ---> ordinal categorical
b. whether a student has previously taken a statistic course ---> categorical
c. student height ---> continuous numerical
d. Population of each state in the U.S. ---> continuous numerical
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