PSYC 230 Final Exam

# PSYC 230 Final Exam - PSYC 230 Final Exam One-Way ANOVA...

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PSYC 230 Final Exam One-Way ANOVA : means one independent variable o Independent Variable: (should have at least three levels) each level is a group of subjects o Dependent Variable: (only one dependent variable) What is “within” group variance? o This is what we’ve been doing whenever we have been figuring standard deviations of curves o Error Variance How is ANOVA different from t-tests : 1. ANOVAs can test more than two means 2. We are comparing sample means indirectly by comparing sample variances Means and Significance: By comparing the within group and between group variance we are able to answer questions about whether the differences between the means of groups are significant Sum of Squares between groups sum of the squared deviations of group means about the overall mean Sum of squares within groups : sum of the squared deviations of all scores about their respective group means 1

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Sum of squares total: sum of the squared deviations of all scores about the overall mean sum of squares: SS within + SS between Mean square within groups: sum of squares within groups divided by its degrees of freedom Mean square between groups: sum of squares between groups divided by its degrees of freedom P-value: o Is it less than .05? o p-value is smaller than 0.05 so we do reject the null hypothesis When the null hypothesis is true : o the ratio of the between-groups population variance (estimate) to the within- groups population variance (estimate) should be about 1. o When the research hypothesis is true, this ratio should be greater than 1 The primary difference between one-way and two-way ANOVAS : o One-way ANOVAs test only one independent variable
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PSYC 230 Final Exam - PSYC 230 Final Exam One-Way ANOVA...

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