Ch. 12-13 ANOVA review

A one-way ANOVA produces SS_total = 80 and SS_{within-treatments} = 30. For this analysis, what is SS_{between-treatments}?

• 50

• 110

• 2400

• More information is needed

A one-way ANOVA yields SS_between=9 and SS_within=40, with df_between=3 and df_within=20. What is the F-ratio?

• 0.23

• 0.67

• 1.50

• Some other value

A researcher compares four conditions with one-way ANOVA. Which of the following could be the alternate hypothesis (H_a)?

• There are no differences among any of the population means.

• One sample mean differs from at least one other sample mean.

• All of the population means differ from one another.

• There is at least one difference among the population means.

If a two-factor analysis of variance produces a statistically significant interaction, then you can conclude...

• that one of the main effects is also significant.

• that neither of the main effects is significant.

• that both main effects are also significant.

• The significance of the main effects is not related to the interaction.

What does it mean if two variables interact in a two-factor ANOVA?

• The effect of one factor depends on the level of the other factor.

• The effect of one factor is independent of the effect of the other factor.

• Both factors have a significant main effect.

• One factor predicts the scores on the other factor.