1. What are some advantages and disadvantages in the use of a posttest-only control group design versus a pretest/posttest control group design? (Must identify at least one advantage and one disadvantage per design – so four total).
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2. What is a confound and how is it related to internal validity?
ANSWER
3. What is the relationship between external validity and the college sophomore problem?
ANSWER
4. On the most recent exam in your biology class, every student earned an A. The professor claims that he must really be a good teacher for all of the students to have done so well. Given the confounds discussed this week, what alternative explanation can you offer for this result? (Don’t just list a concern– briefly provide a justification).
