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):

Age

Explanation:

Independent variable: In a psychological or scientific experiment, the term independent variable is defined as the variable that is being manipulated or controlled or changed during an experiment by the experimenter.

In an experiment, the experimenter changes or manipulates the independent variable to see its effects on the dependent variable, i.e, any changes in the independent variable will cause changes or alteration in the dependent variable.

In the question above, the independent variable is Age.

the first settlements began along the huang river because of the importance of the huang river in the beginning of china. it goes back to the story, “the tale of emperor yu”, which references the tale of the great flood, which was caused by the huang river and was believed to create and influence china’s making.

    racial conflict and discrimination has existed ever since man learned to kill with rocks and bones. these conflicts arose from disputes between territory, power, wealth, religion, or simple difference. some of the most infamous racial disputes include slavery, the holocaust, and the civil rights movement.

    these listed disputes often resulted in casualties from all sides. riots, wars, imprisonment, and lynching are all commonly associated with racial conflict on severe levels.

      however, racism is an improving issue in recent decades. people are being more accepting and welcoming of diverse populations. though, the world isn't perfect and it will take much more time, if ever, until the world is rid of racism.