______ means that, within the conditions created artificially by the researcher, the effect of the independent variable on the dependent variable is isolated from other plausible explanations.

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Internal validity refers to the extent to which a study can confidently infer a cause-and-effect relationship between the independent and dependent variables. This requires that the effect of the independent variable on the dependent variable is isolated from other plausible explanations. External validity, on the other hand, refers to the extent to which the findings of a study can be generalized to other populations, settings, or times. Random assignment is a technique used to create equivalent groups in a study, and selection bias refers to participants being chosen in a way that is not random and may introduce bias into the study.

______ Means That, Within the Conditions Created Artificially by the Researcher