Mathematics

Gaige Francis

16 May, 06:38

Fifty undergraduate and twenty graduate student volunteers participated in a study of whether ambient temperature affects cognition. Twenty-five undergraduate and ten graduate students were randomly assigned to a 60° room; the others were assigned to an 85° room. Each group was asked to memorize a list of nonsense words. The researchers compared the average number of words memorized for the two groups. What type of variable is student classification (graduate or undergraduate) ?

a. Treatment variable

b. Blocking variable

c. Explanatory variable

d. Lurking variable

e. Response variable