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.
What are independent variable(s) and dependent variable(s) in
this study?
What are the null hypothesis and alternative hypothesis of this
study?
What type of research design is Dr. Paddock's study?
What type of statistical test would Dr. Paddock use to test his
hypotheses?
How can Dr. Paddock address these threats to internal
validity?