A researcher has manipulated only one independent variable at two levels,has held constant as many other variables as possible and has balanced individual differences by using random assignment.The researcher is likely to be able to claim that the independent variable caused the observed changes in the dependent variable because the experiment is

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Quizplus · Accepted Answer

The experiment described in the question has good internal validity because the researcher has controlled for extraneous variables and used random assignment to balance individual differences. This means that any changes observed in the dependent variable can be attributed to the manipulation of the independent variable, rather than other factors. The other answer choices are not applicable: B refers to the extent to which the findings can be generalized to other populations or settings, C refers to a statistical analysis of multiple studies, and D refers to the consistency and accuracy of the measurements used in the experiment.

A Researcher Has Manipulated Only One Independent Variable at Two