Internal validity refers to

the extent to which an investigation rules out or makes implausible alternative explanations of the results.

any event that happens to virtually all the subjects that might explain the findings of an experiment (threat to internal validity).

processes within the participants that change over time and include growing older, wiser, and more tired (threat to internal validity).

occurs when there are systematic differences between groups before any experimental manipulation or intervention (threat to internal validity).

Diffusion of Treatment is

when two or more groups receive a blurring of the treatment boundaries (threat to internal validity)

Testing refers to the

effects that taking a test may have on subsequent performances on the second testing (threat to internal validity)

External validity refers to

the extent to which the results of an investigation can be generalized beyond the conditions of the experiment to other populations, settings, and circumstances.

Sample characteristics refers to

characteristics of the sample which might contribute to generality threats such as college students, convenience samples, and the limited inclusion of underrepresented groups

occurs when a pretest may influence a subject's response to an intervention (threat to external validity).

Random assignment to treatment and control groups (or comparison groups)

helps control for several threats of internal validity including history, maturation, testing, selection bias, instumentation, and statistical regression.

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Flashcard Quiz 2

Term	Definition
Internal validity refers to	the extent to which an investigation rules out or makes implausible alternative explanations of the results.
History refers to	any event that happens to virtually all the subjects that might explain the findings of an experiment (threat to internal validity).
Maturation refers to	processes within the participants that change over time and include growing older, wiser, and more tired (threat to internal validity).
Selection Bias	occurs when there are systematic differences between groups before any experimental manipulation or intervention (threat to internal validity).
Diffusion of Treatment is	when two or more groups receive a blurring of the treatment boundaries (threat to internal validity)
Testing refers to the	effects that taking a test may have on subsequent performances on the second testing (threat to internal validity)
External validity refers to	the extent to which the results of an investigation can be generalized beyond the conditions of the experiment to other populations, settings, and circumstances.
Sample characteristics refers to	characteristics of the sample which might contribute to generality threats such as college students, convenience samples, and the limited inclusion of underrepresented groups
Test sensitization	occurs when a pretest may influence a subject's response to an intervention (threat to external validity).
Random assignment to treatment and control groups (or comparison groups)	helps control for several threats of internal validity including history, maturation, testing, selection bias, instumentation, and statistical regression.

Created by: Bizzie B

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