RESEARCH STUDY 13

Essay

RESEARCH STUDY 13.4: Dr.Fletcher is interested in understanding whether joining a fraternity/sorority causes people to become more concerned about their attractiveness and appearance.He recruits a group of 55 freshmen (25 males, 30 females) who are planning to go through fraternity/sorority recruitment on his campus.After they join, he gives them a measure of attractiveness concern/appearance concern (the Body Concern Scale, where higher scores indicate higher body concerns).
In addition to measuring the body concern of the participants who joined a fraternity/sorority immediately before and immediately after they join, Dr.Fletcher measures them for the 3 weeks before and the 3 weeks after.Based on the results below, explain whether Dr.Fletcher should be concerned about a testing threat to internal validity.