2-Way ANOVA

Question 1

Why do we use a 2-way ANOVA?

Answer 1

Compares means of dependent variables between groups constructed from 2 independent variables

Question 2

What are the assumptions?

Answer 2

Samples come from a normal population (box plot), Equal population variance (IQR, Levene’s test), Means plots (interaction or no interaction)

Question 3

If there is no interaction, do we use main or simple effects?

Answer 3

Main

Question 4

If there is interaction, do we use main or simple effects?

Answer 4

Simple

Question 5

Hypotheses for 2 Way ANOVA?

Answer 5

H0: _____ (independent variable), and ________ (independent variable) do not interact to affect mean _____ (dependent variable).

Ha: ______ and ______ interact to affect mean _______

Question 6

What values do we report in a 2 way ANOVA?

Answer 6

Test statistic (F), p-value

Question 7

Conclusion for 2 way ANOVA?

Answer 7

There is/isn’t sufficient evidence to support that ___ and ___ affect the mean ______. We reject/fail to reject H0.