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)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 study focuses on how the level of happiness changes over time for different age groups (under 65 and 65+). The level of happiness is the dependent variable in this study. Gender and marital status are not mentioned as factors being studied, so they are not independent variables.

Professor Rodgers Found That the Average Level of Happiness Reported