The experimental factor that is manipulated; the variable whose effect is being studied is called what?

The experimental factor that is manipulated; the variable whose effect is being studied is called what?

• A. Independent variable
• B. Dependent variable
• C. Confounding variable
• D. Moderator

Answer: (A)

In experiments, the factor you deliberately change to see if it causes a change in an outcome is the independent variable. You set it at different levels and observe how the dependent variable responds, while keeping other variables constant. The outcome you measure—the result of interest—is the dependent variable. A confounding variable is any uncontrolled factor that varies alongside the independent variable and can influence the outcome, making it hard to know what caused the effect. A moderator is a variable that changes the strength or direction of the relationship between the independent and dependent variables, meaning the effect may differ depending on the level of the moderator. For example, testing how caffeine affects reaction time: caffeine intake is the independent variable; reaction time is the dependent variable; sleep quality could be a confound if not controlled, and age could be a moderator if caffeine helps more for younger people than older ones.

In experiments, the factor you deliberately change to see if it causes a change in an outcome is the independent variable. You set it at different levels and observe how the dependent variable responds, while keeping other variables constant. The outcome you measure—the result of interest—is the dependent variable. A confounding variable is any uncontrolled factor that varies alongside the independent variable and can influence the outcome, making it hard to know what caused the effect. A moderator is a variable that changes the strength or direction of the relationship between the independent and dependent variables, meaning the effect may differ depending on the level of the moderator. For example, testing how caffeine affects reaction time: caffeine intake is the independent variable; reaction time is the dependent variable; sleep quality could be a confound if not controlled, and age could be a moderator if caffeine helps more for younger people than older ones.