I know the six types of threats to internal validity; selection…

Question Answered step-by-step I know the six types of threats to internal validity; selection… I know the six types of threats to internal validity; selection bias, mortality, testing effects, instrumentation threats, maturation threats.  Why would you argue that selection bias is the most significant threat?  I believe one factor is that it occurs at the outset of the study it skews the results of the entire research project.  What other factors would you argue make it the most important threat to internal validity? Health Science Science Nursing PNUR 4575 Share QuestionEmailCopy link Comments (0)