Threat to the internal validity of an experiment | Homework Helpers

Which one of the following is not a threat to the internal validity of an experiment?

maturation
regression effect
random error
mortality
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An experiment in which extraneous variables are controlled is said to be

internally reliable
internally valid
externally valid
externally reliable

Using a convenience sample instead of a random sample of subjects is a threat to which kind of validity?

internal
external
construct
statistical

Any bias in selecting subjects for an experiment threatens the ____ of the experiment.

internal validity
internal reliability
statistical validity
statistical reliability
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