Sample selection bias is a threat to internal validity that occurs when:

Question

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Sample selection bias occurs when the groups in which individuals are assigned are not random, meaning that the sample is not representative of the population being studied. This can lead to inaccurate conclusions about the relationship between the independent and dependent variables, as the sample may not be representative of the population as a whole. Choice A refers to history threat, choice B refers to diffusion of treatment, and choice D refers to testing effects.

Sample Selection Bias Is a Threat to Internal Validity That