ANOVA Part 3

Question 1

What do Factorial ANOVAs do?

Answer 1

They assess two or more factors at the same time.
- Assess main effects
- Assess interactions

Question 2

When there are two factors with two levels each, interactions always reflect either…

Answer 2

• X pattern
• V pattern

Question 3

When there are two factors with two levels each, the main effects reflect what?

Answer 3

The difference when the levels are averaged (mean)

Question 4

How do you calculate factor variance

Answer 4

1. calculate the means for all your groups + the grand mean
2. calculate the variance for each of your groups - ‘between variance calculation’

Question 5

How do you calculate error variance?

Answer 5

1. calculate the means for all combinations of your factors
2. subtract the participants memory score from the corresponding mean
3. square the differences
4. add them all up

Question 6

How do you calculate total variance?

Answer 6

Same as error variance apart from you take the difference from the grand mean instead of the specific group mean.

Question 7

How do you calculate F-test for Factorial ANOVA

Answer 7

1. input sum of squares
2. calculate the degrees of freedom
3. divide the sum of squares by the corresponding df
4. divide the MS of your factors + interaction from the MS error
5. compare the F-value to the F-critical