________ threats to internal validity arise when respondents drop out of the research between the pretest and the post-test and,as a result,it cannot be determined if differences between the two tests are the the result of the experimental treatment or are the result of different group characteristics at the two stages of measurement.
A)Mortality
B)Researcher bias
C)Selection
D)Testing
E)Premeasurement

Question

Quizplus · Accepted Answer

Mortality threats refer to the loss of participants during a study, which can lead to sampling bias and differences in groups at different stages of measurement. This can potentially affect internal validity if those who drop out have different characteristics than those who remain in the study, making it difficult to determine if any observed differences between pretest and post-test are due to the experimental treatment or due to differences in the groups themselves.

________ Threats to Internal Validity Arise When Respondents Drop Out