PSYC 2360 Lecture Notes - Lecture 4: Random Assignment, Experiment, Social Desirability Bias
22 Nov 2018
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Chapter 4: the psychologist"s toolbox (tools to building better designs: chapter 4 outline, choosing the right design, experiments vs quasi-experiments, measuring variables, self-report, behavioural measures, types of measurement error, random error, bias. In a true experiment would assign the children to the treatment and to the control conditions in a random fashion. In a quasi-experiment, we might be required to use intact groups (e. g. , school a and school b). We flip a coin to decide which school receives the therapy, but we do not randomly assign within the schools: we compare differences in observe2 and conclude the difference is due to. School b observe1 observe2 the treatment: however, there could be a difference at observe1 that may cloud the conclusion. Bias (systematic error) will threaten validity: recruitment of participants: sampling strategies, **note: this slide serves as an overview of the different methods.
