Problem
1. Describe the threats to internal validity discussed in the text: history, maturation, testing, instrument decay, regression toward the mean, and selection differences.
2. Describe the nonequivalent control group pretest-posttest design. Why is this a quasi-experimental design rather than a true experiment?
The response should include a reference list. Double-space, using Times New Roman 12 pnt font, one-inch margins, and APA style of writing and citations.