Professor Rodgers found that the average level of happiness reported by people under 65 years of age declined from 1957 to 1970.However,for this same group,the average level of happiness increased slightly from 1970 to 1978.Rodgers also found that the average level of happiness reported by people age 65 and older increased from 1957 to 1978.A(the)variable(s)in this study is(are):
A)aged 65 and older
B)less than age 65
C)age
D)age 65
E)all of these choices are variables

Question

Quizplus · Accepted Answer

The variable in this study is age because the study focused on how the average level of happiness changed over time for different age groups. The specific age categories (under 65 and 65 and older) are subsets of the overall variable of age.

Professor Rodgers Found That the Average Level of Happiness Reported