PSYC 251 Lecture Notes - Lecture 7: Constructive Proof, Relate, Naturalistic Observation
Document Summary
Why do we do experiments? have correlations. When participants can be randomly assigned to different levels of the ivs. Many questions we want answers to can"t be turned into an experiment. Can"t randomly assign participants to different levels of an iv. When participants cannot be randomly assigned to different levels of all the ivs. What if we want to compare two or more groups that we know are different from the outset. History: natural changes that occur that people experience. Maturation: natural improvements or changes seen over time with development. Regression to mean: the idea that extreme scores and time 1 are less extreme at time 2. Change could just be part of a pre-existing trend. Involves taking several measures pre and post intervention/treatment. The point is to obtain a reliable baseline measure and then observe the effect after introducing a change. Taking multiple measures allows the identification of trends.
