Researchers wanted to determine if having a television (tv) in the bedroom is associated with obesity. the researchers administered a questionnaire to 385 twelve-year-old adolescents. after analyzing the results, the researchers determined that the body mass index of the adolescents who had a tv in their bedroom was significantly higher than that of the adolescents who did not have a tv in their bedroom. complete parts (a) through (e). (a) why is this an observational study