PSY 124: Behavioral Research Variability
PSY 124: Behavioral Research Variability PSY 124 - 03
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PSY 124 - 03
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This 2 page Class Notes was uploaded by Layne Franklin on Monday February 8, 2016. The Class Notes belongs to PSY 124 - 03 at University of Indianapolis taught by Jordan Sparks Waldron in Fall 2015. Since its upload, it has received 17 views. For similar materials see Fndtns/Psyc Science I:Methods in Psychlogy at University of Indianapolis.
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Date Created: 02/08/16
Behavioral Variability in Research Behavioral Variability. ◦ The degree to which scores in a set of data differ or vary from one another. Psychology and the Behavioral Sciences involve the study of Behavioral Variability. ◦ Behavior varies across situations. ◦ Behavior varies among individuals. ◦ Behavior varies over time. Variance: A numerical index of the variability in a set of data -> tells us how much scores differ from a central number Standard deviation: Square root of the variance Advantages over range: Takes into account ____ when calculating variability in a set of data Distributions with High Behavioral Variability ◦ Scores will be spread out around the mean. ◦ Variance will be high. Distributions with Low Behavioral Variability ◦ Scores will cluster around the mean. ◦ Variance will be low. Systematic Variance ◦ Variability in participants’ behavior that is related to the variables of interest. Error Variance ◦ Unaccounted for Variance; Variance due to other factors. Total Variance ◦ Systematic Variance + Error Variance Distinguishing between systematic and error variance. ◦ Statistical Analyses ◦ How much of the variance is systematic vs. error? ◦ Is the amount of systematic variance large enough to conclude the effect is real? Error variance masks the relationship between the variables. ◦ Individual Differences ◦ Error in Research Reducing Error Variance ◦ Experimental Control, Standardization of Protocol, Homogeneity Among Participants Proportion of Systematic Variance = .00 ◦ 0% of variance is due to variables under study. Proportion of Systematic Variance = 1.00 ◦ 100% of variance is due to variables under study. Effect Size ◦ Measures the strength of associations. ◦ Cohen’s d, Eta-Squared, Correlation, Odds Ratio
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