The variable manipulated by the researcher in an experiment is called the

AResponse variable

BIndependent variable ✓ Correct

CDependent variable

DExtraneous variable

Correct answer: (B) Independent variable

Explanation

The variable manipulated by the researcher in an experiment is the independent variable.

Its levels are set deliberately to test their effect on the outcome.

A response variable is another name for the dependent variable, the measured effect.

The dependent variable is observed as the outcome and is not the one manipulated.

An extraneous variable is an uncontrolled outside factor, not the deliberate manipulation.

The manipulated independent variable in this active form is also called an active variable.

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