In 1965, About of U

question 26

Multiple Choice

In 1965, about of U.S. adults smoked cigarettes; today about do so.

• A) 15%; 25%
• B) 42%; 20%
• C) 25%; 25%
• D) 60%; 40%

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Definitions:

Dependent Variable

In research, it's the variable that is tested and measured, often to see the effects of variations in the independent variable.

Researcher's Manipulation

The deliberate alteration of variables by a researcher in an experiment to determine cause and effect relationships.

Independent Variable

A variable that is manipulated or changed in an experiment to determine its effect on a dependent variable.

Dependent Variable

In an experimental setting, the variable that is being tested and measured, which is expected to change as a result of manipulations in the independent variable.