If a study is designed in such a way that it doesn't test the experimenter's hypothesis, it is said to lack:

Name: If a study is designed in such a way that it doesn't test the experimenter's hypothesis, it is said to lack:
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Internal validity refers to the extent to which a study can demonstrate a causal relationship between variables. If a study doesn't test the experimenter's hypothesis, it lacks internal validity because it cannot establish a cause-and-effect relationship.

If a Study Is Designed in Such a Way That