replicated procedures used in previous experiments 2. used introductory psychology students 3. asked all participants to write on three onsecutive days in large groups 4. had consistent or balanced extraneous variables Show lessa researcher tested whether writing about forgiveness causes similar health benefits as emotional wr Show more a researcher tested whether writing about forgiveness causes similar health benefits as emotional writing. she randomly assigned 60 students of an introductory course to one of three conditions: forgiveness writing emotional writing or superficial writing. all participants wrote for 15 minutes on three consecutive days in large groups in their classrooms. six months after writing the researchers obtained health center visits for all participants. the mean number of health center visits is listed below.1.5 1.75 2.5 the alternative explanation that erroneous variables produced the different health center outcomes is ruled out because the researher 1. replicated procedures used in previous experiments 2. used introductory psychology students 3. asked all participants to write on three onsecutive days in large groups 4. had consistent or balanced extraneous variables Show less