In evaluating experiments,two kinds of validity must be considered: internal and external.

Name: In evaluating experiments,two kinds of validity must be considered: internal and external.
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Internal validity refers to the extent to which the experiment has controlled for all possible third variables that may have influenced the results, while external validity refers to the extent to which the results of the experiment can be generalized to other populations and situations.

In Evaluating Experiments,two Kinds of Validity Must Be Considered: Internal