PSYC10004 Lecture Notes - Lecture 3: Repeated Measures Design, Observational Error, Meta-Analysis
16 Oct 2018
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Document Summary
Hypothesis testable predictions generated by a theory, usually specifies variables. Independent variables some aspect of the experimental situation that is manipulated. Dependent variable aspect of the behaviour that is measured. One-tailed predicts nature of the effect of the independent variable on the dependent variable. Two-tailed predicts that independent variable will have an effect on dependent variable, but unspecified direction. Random samples selecting participants on some random basis. Systematic sampling participants are selected in a quasi-random way. Quota sampling selecting participants at random from a population so that they are similar to it in certain respects. Stratified sampling participants according to certain characteristics. Confounding variables variables that are mistakenly manipulated or allowed to vary with the independent variable. Controlled variables: variables not of interest are held constant or controlled. Constant error unwanted variable that has a systematically different effect on the dependent variable in different conditions. Random error 0 unsystematic and unwanted that influences the dependent variable.
