A manipulated independent variable is called

A manipulated independent variable is called an active variable.

It contrasts with an attribute variable, which the researcher only measures and cannot manipulate.

An extraneous variable is an unwanted influence outside the study's focus.

An intervening variable is a hypothetical construct linking cause and effect internally.

A subject variable is a pre-existing characteristic of participants that cannot be manipulated.

Age, gender and inborn traits are attribute variables rather than active ones.