External and internal validity go hand in hand.An experiment lacking in one is probably lacking in the other.
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Q3: The internal validity of an experiment depends
Q5: The history effect occurs when events external
Q9: For a study to be called an
Q10: Laboratory experiments give the researcher greater control
Q12: The history effect primarily threatens the internal
Q14: In marketing studies, the primary source of
Q16: A causal relationship between an action and
Q17: Because the validity issue in any experiment
Q20: Field experiments tend to have much greater
Q21: A researcher studying the effects of several
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