5: 2-way independent ANOVA

Question 1

If you had a study with 2 IVs, and was a between participants deign, what statistical test would you use?

Answer 1

2-way independent AVOVA

Question 2

what is a factorial ANOVA?

Answer 2

any 2-way AVOVA

Question 3

what is the non-parametric equivalent to a factorial ANOVA?

Answer 3

there isn’t one

Question 4

How do you find the F statistic for an interaction in a 2-way independent ANOVA?

Answer 4

mean square for interaction/
mean square error

Question 5

what is a test of simple effects?

Answer 5

the effect of an IV at a single level of another IV

Question 6

when do you perform tests of simple effects?

Answer 6

when there is a significant interaction between IVs

Question 7

what statistical test is used for a test of simple effects?

Answer 7

t-test (which depends on within/between participants)

Question 8

how do we correct for the multiple comparisons that come from using t-tests to test simple effects (statistical test)?

Answer 8

bonferroni/ tukey HSD

Question 9

how do we correct for the multiple comparisons that come from using t-tests to test simple effects (statistics)?

Answer 9

divide required alpha level (e.g. α = .05) by the number of comparisons (c)
e.g. 4 comparisons: .05/4 = .013
So, we’d conclude the paired comparison is significant IF p < .013

Question 10

when doing a test of simple effects, do you run t-tests between IV levels of within IV levels?

Answer 10

?