FREE Bachelor of Arts in Psychology: Methodical & Stats Analysis Questions and Answers Flashcards
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Read the first 6 FREE Bachelor of Arts in Psychology: Methodical & Stats Analysis Questions and Answers flashcards as text
A researcher reports Cohen's d = 0.25. How would this effect size be classified?
Answer: Small
According to Cohen's conventions, d = 0.20 is small, 0.50 is medium, and 0.80 is large, making 0.25 a small effect.
Which threat to internal validity occurs when participants drop out of a study at different rates across conditions?
Answer: Attrition
Differential attrition can bias results by making groups non-equivalent over time.
In multiple regression, what does multicollinearity refer to?
Answer: High correlations among predictor variables
Multicollinearity occurs when predictor variables are highly correlated, inflating standard errors of coefficients.
A researcher uses a within-subjects design where every participant experiences all conditions. What is the primary advantage?
Answer: Reduced individual difference variability
Within-subjects designs control for individual differences because each participant serves as their own control.
What is the purpose of post-hoc tests following a significant one-way ANOVA?
Answer: To determine which specific group means differ
Post-hoc tests identify which specific pairs of group means are significantly different after a significant omnibus F-test.
Which type of reliability is assessed by having two raters independently score the same set of behavioral observations?
Answer: Inter-rater reliability
Inter-rater reliability measures the degree of agreement between two or more independent raters.