PSY 290A Lecture Notes - Lecture 87: Demand Characteristics, Internal Validity, Random Assignment

• School: University of Arizona
• Department: Psychology Main
• Course: PSY 290A
• Professor: Dana Narter

Document Summary

Nonequivalent control group design (pretest/posttest: can be repeated-measures. Nonequivalent groups interrupted time-series design: design and results, with a quasi-experiment, you will use both the design and the results to evaluate the validity of a causal statement. Small-n experiments - studying only a few individuals. Can we conclude that the therapy caused her symptoms to improve: multiple-baseline design. Experiments do not always take place in ideal conditions, with clean manipulations, large samples of participants, and perfect random assignment. Quasi-experiments and small-n designs use strategies that optimize naturally occurring groups or single individuals. Quasi-experiments: quasi-experiments can use independent-groups designs, such as a nonequivalent control group design and a nonequivalent control group pretest/posttest design. Small-n designs: studying only a few individuals: small-n studies balance an intense, systematic investigation of one or a few people against the usual approach of studying groups of people. To prioritize as they study a particular issue in psychological science.