The following is not a threat to external validity: a. the treatment being studied is not representative of the treatment that would be implemented more broadly. b. the experimental sample is not representative of the population of interest. c. experimental participants are volunteers. d. partial compliance with the treatment protocol.
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External validity refers to the extent to which the results of a study can be generalized or applied to other settings, populations, or time periods. It's about the applicability of the study's findings beyond the specific conditions of the study. Show more…
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