Experimental Research: Which statement best describes?

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The key idea here is true experimental research, where you deliberately change an independent variable, randomly assign participants to groups, and compare outcomes with a control group. This setup lets you attribute observed effects to the intervention rather than to other factors, because randomization balances known and unknown confounders and the control group provides a baseline for comparison.

That’s why the description is the best fit: it includes manipulating the variable, random assignment, and a control group—the combination that supports causal conclusions. In contrast, quasi-experimental designs also involve manipulation but often omit randomization or a proper comparison group, weakening causal claims. Non-experimental research lacks both manipulation and randomization. RCTs are a specific example of true experimental design, embodying these same elements.