RESEARCH STUDY 10.3 Dr. Paddock Is a Counseling Psychologist Who Is Interested in Is

RESEARCH STUDY 10.3
Dr. Paddock is a counseling psychologist who is interested in decreasing adjustment issues in first-year college students. She is curious if having students create collages of their first few weeks of school and then mailing them home will help students feel they have integrated their new life with their old and, as a result, will help them feel less homesick. She samples a group of 100 incoming college freshmen at her university and measures how homesick they are during the first week of school. During Week 4 of school, she has them make the collage and send it home. During Week 7 of school, she measures their homesickness again. She notices a significant reduction in the amount of homesickness from the pretest to the posttest and concludes that her treatment is effective.
-Refer to Research Study 10.3 above to answer the following question.
Name two threats to internal validity that are possibly present in Dr.Paddock's study.What other explanation do these threats provide for the results found by Dr.Paddock?