7 - Analysis of Variation, Post-hoc

Question 1

What is the difference between ANOVA oneway and post-hoc?

Answer 1

• ANOVA oneway = 1 independent variable

- Post-hoc = > 1 independent variable

Question 2

What does it mean when groups are listed w/ their means and 2 or more groups have a line underneath their means?

Answer 2

Those w/ the line under them have been determined to be not significantly different

Question 3

How can you tell if 2 variables have a significant interaction based on a graph?

Answer 3

• Parallel (or near parallel) lines = not likely to be significant
• Non-parallel lines = likely to be significant

Question 4

How can you tell if a variable has an effect based on an ANOVA graph?

Answer 4

Will have an effect if means are different (ex: mean of low and high are different)

Question 5

What are the 3 sets of hypothesis tests for the two-way ANOVA?

Answer 5

1. Means of each row are equal/ the mean of at least 1 row is different
2. The means of each column are equal/ the mean of at least 1 column is different
3. There is no interaction between the row and column/ there is interaction between the row and column

Question 6

How do you determine the df for an interaction between the column and row?

Answer 6

df of column * df of row = df of interaction

Question 7

How do you calculate MS?

Answer 7

SS / df

Question 8

How do you determine the F value for each variable for a two-way ANOVA?

Answer 8

F = MS for each variable / MS for error source