One threat to a study's validity is the possibility of reactivity, which refers to the tendency for participant to change their behavior when they

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Reactivity occurs when participants change their behavior because they are aware that they are being observed. This is a threat to the study's validity because it can cause participants to behave differently than they normally would, which can impact the accuracy of the results. The other choices, such as wanting to sabotage the study, being told the results are confidential, or receiving excessive compensation, are not necessarily related to reactivity and may have their own potential impacts on the study's validity.

One Threat to a Study's Validity Is the Possibility of Reactivity