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. An(the)independent variable(s)in this study is(are)
A)people.
B)level of happiness.
C)age.
D)gender.
E)marital status.

Question

Quizplus · Accepted Answer

The independent variable in this study is age, as the researcher is comparing the changes in happiness levels between two specific age groups (under 65 vs 65 and older) over a period of time. All other variables listed (people, level of happiness, gender, marital status) are dependent variables, as they are being measured and compared to changes in age.

Professor Rodgers Found That the Average Level of Happiness Reported