______________is the threat that research participants will not form equivalent groups.It plagues designs without random assignment.

Question

Quizplus · Accepted Answer

Selection bias is the threat to internal validity where the participants are not equivalent in the groups due to non-random assignment, leading to differences in the groups pre-existing conditions. This can lead to confounding variables and inaccurate estimates of the treatment effect. Experimental mortality refers to differential dropout rates and participant attrition, treatment integrity is the level to which a treatment is applied consistently, and internal validity refers to the degree that the treatment effect can be attributed to the independent variable rather than extraneous factors.

______________Is the Threat That Research Participants Will Not Form Equivalent