Which of the following research designs allows for the systematic exclusion of extraneous variables that are different from your interest?

Experimental research is the design that allows the systematic exclusion and control of extraneous variables.

By manipulating one variable while holding others constant, it isolates the factor of interest.

Longitudinal research follows subjects over time but does not systematically control extraneous variables.

Comparative research contrasts groups or cases without the controlled elimination of confounds.

Correlational research measures associations between variables but cannot exclude extraneous influences.

Only the experimental design, through control and randomisation, removes variables outside the researcher's interest.

This control is what lets experiments support cause-and-effect claims.