PSYC 201W Chapter Notes - Chapter 11: Institute For Operations Research And The Management Sciences, Program Evaluation, Needs Assessment
20 Nov 2017
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Quasi-experiment: has some features of an experiment, but lacks key aspects of experimental control. Examine the effects of treatment (like true experiments) Participants are exposed to a treatment and a dv is measured. Some ways in which quasi-experimental designs may differ from true experiments: Iv: experimenter may not be able to control aspects of the iv that involve time or participant sample. These may be decided by outside people or natural forces (i. e. victims of an earthquake) Dv: experimenter may not be able to control how, when, and for whom dependent variables are measured. Extraneous variables: experimenters typically have little control over extraneous variables. Participants: treatment and control groups cannot be assumed equivalent since random assignment does not occur. Often, there is only a treatment group whose responses are measured before and after. The key difference between a true experiment and quasi-experiments is that quasi- experiments rarely are able to use random assignment.
