Chapter 08 True/False Quiz

Quiz Content

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. Threats to internal validity consist of categories of extraneous variables that may be confounded with the independent variable.

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. Pretesting or measuring subjects twice in the same study controls for testing effects.

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. The use of a nonprobability sample makes selection a threat to internal validity.

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. Pre-experimental designs lack one or more features of a true experiment.

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. True experimental designs control for threats to internal validity.

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. In social research, within-subject designs are preferable to between-subject designs.

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. The external validity of true experimental designs may be limited by the interaction of the independent variable with some other feature of the experiment.

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. An interaction effect occurs when the effect of one independent variable depends on the level of another variable.

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. Quasi-experimental designs contain all the features of a true experiment except the manipulation of the independent variable.

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. One nonessential feature of experiments that quasi-experimental designs often omit is a pretest.

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