Between Subjects ANOVA

Question 1

Between Subjects ANOVA

Answer 1

-One factor with three or more levels

-Each group has different people

Question 2

Assumptions of a Between Subjects ANOVA

Answer 2

Formal:
-Homogeneity of Variance
-Normality
– Assumes the error is normally distributed
-Independence
–Assumes that observations/errors are independent of each other

Informal:
-No outliers
-Sample size is equal across groups

Question 3

Mean Square Between

Answer 3

Average amount of variation between the group means

Question 4

Mean Square Error

Answer 4

Average amount of variation within each sample

Question 5

MSb / MSe = ?

Answer 5

F Value

Question 6

Why is it called F-value

Answer 6

Named after Sir Ronald Fisher

Question 7

Sum of Squares Between Subjects

Answer 7

Variability between group means and the grand mean

Question 8

Sum of Squares Error

Answer 8

Differences between the individual scores and their respective group means

Question 9

Between Subjects ANOVA Null Hypothesis

Answer 9

All group means are the same

Question 10

What does it mean to reject the null?

Answer 10

At least one group differs from the other

Question 11

Effect Sizes: Generalized Eta Squared

Answer 11

Percentage of variance in the dependent variable that is due to the independent variable

Problem: Always overestimates variance

Question 12

Effect Sizes: Omega Square

Answer 12

Better and more accurate
-Ex: Omega squared of .72 means that 72% of the variance in the dependent variable was due to the independent variable

Question 13

Plots you can use

Answer 13

-Boxplot
-Estimated Marginal Means Plot