L1 ANOVA Practices

When and why do we use Independent One-way ANOVA?

• To compare more than 2 means

• To be used on studies with more than 2 IV levels and 1 DV

• When IV is continuous

• To be used on studies with more than 1 IV levels

Why do we use ANOVA instead of t-test?

• Using several t-tests increases Type I error

• Using several t-tests increases Type II error

• Using several t-tests decreases Type I error

• Using several t-tests decreases Type II error

What are the assumptions for independent one-way ANOVA?

• Assumption of Normality

• Assumption of Homogeneity of Variances

• Assumption of paired samples correlation

• Assumption of Sphericity

Which of the following is correct about the F statistic of independent one-way ANOVA?

• (between-groups variability) / (within-groups variability)

• Effect / Error

• Ideally, F should exceed 1

• F statistic determines whether variation due to IV is larger than would be expected on the basis of error variation alone

If the assumption of homogeneity of variances is violated, and sample sizes are unequal in independent one-way ANOVA, what should we proceed with?

• Refer to Welch's F for statistical test

• Refer to Games-Howell for post hoc test

• Refer to Bonferroni for post hoc test

• Refer to Greenhouse-Geisser for statistical test

Which of the following is the F statistic of repeated measures one-way ANOVA

• effect / error

• (Between-groups variability with no individual differences possible) / (within-groups variability with individual differences removed)

• F is significant when < .05

• F is ideal when < .001

What of the following is/are assumptions of repeated measures one-way ANOVA?

• Homogeneity of Variances

• Homogeneity of Sphericity

• Assumption of Normality

• Pearson's correlation

When the assumption of Sphericity is violated in repeated measures one-way ANOVA, how should we proceed?

• Read chi-square value, if value is >.75, proceed with Huyndt-Felt test

• Read chi-square value, if value is <.75, proceed with Huyndt-Felt test

• Read Epsilon value, if both values <.75, use Greenhouse-Geisser

• Read Epsilon value, if both values >.75, use Greenhouse-Geisser

In indepedent one-way ANOVA, which information indicates that the assumption of Sphericity is assumed?

• When p > .05

• When p < .05

• When r > .05

• None of the answers are correct

Answer explanation

Assumption of Sphericity is only in Repeated measures one-way ANOVA and not in Independent one-way ANOVA

What assumption does the Levene's Test test for?