module 6 Flashcards
(14 cards)
What is a one-way repeated measures ANOVA used for?
A: It’s used when the same participants are measured in all experimental conditions, to compare several means.
What is another name for one-way repeated measures ANOVA?
A: One-way within-subjects ANOVA.
What is the main advantage of a repeated-measures ANOVA?
A: It controls for individual differences by accounting for variability within subjects.
What are the components of variance in a repeated-measures ANOVA?
A:
SSTotal (Total variance)
SSBetween (Between conditions)
SSSubject (Within subjects)
SSError (Unexplained variance)
What is the F-ratio formula for repeated-measures ANOVA?
A: F = MSBetween / MSError
What assumption is unique to repeated-measures ANOVA?
A: Sphericity – the variances of the differences between all combinations of conditions are equal.
How is sphericity tested in SPSS?
A: Using Mauchly’s Test.
What happens if sphericity is violated?
A: The F-test may become biased; corrections like Greenhouse-Geisser or Huynh-Feldt are applied.
A: Participants played Jenga under different noise conditions: No noise, Booing, Cheering.
In the eyewitness study, what was the IV and DV?
A:
IV: Attentional Focus (Face, Body, Clothing)
DV: Identification Accuracy (% correctly identified)
What were the main hypotheses in the eyewitness study?
A:
Accuracy is better when attending to face/body vs. clothing.
Face leads to better accuracy than body.
What corrections are used if sphericity is violated?
A:
Greenhouse-Geisser (conservative)
Huynh-Feldt (less conservative)
What output does SPSS provide in a repeated-measures ANOVA?
A:
Descriptive stats
Mauchly’s Test for Sphericity
ANOVA table (F-ratio)
Pairwise comparisons (e.g., Bonferroni)
What is partial eta squared?
A: A measure of effect size in ANOVA; in one-way ANOVA, it equals eta squared.
