Independent ANOVA

Question 1

Why do we run ANOVAs?

Answer 1

-With each t test there is a 5% chance of saying there is a difference when there really isn’t a difference (p = .050)
 Type 1 error: Falsely rejecting the null hypothesis
 Familywise error: Inflating chance of finding something

Question 2

What is experimental variance?

Answer 2

 Due to experimental manipulation Variability between conditions
-Lots of difference between conditions

Question 3

What is random variance?

Answer 3

- Due to measurement error
 Due to individual differences 
 Due to unmeasured variables 
 Variability within conditions
-Lots of difference within conditions

Question 4

Planned comaparison - deviation

Answer 4

Compares the effect of each condition (except the first– defined as “reference”) to the overall condition
2 vs 1234
3 vs 1234
4 vs 1234

Question 5

Planned comparison - simple

Answer 5

Compares the effect of each condition to the control (defined as “reference” and “first”) condition
1 vs 2
1 vs 3
1 vs 4

Question 6

Planned comparison - difference

Answer 6

Compares the effect of each condition to the overall effect of all previous conditions
4 vs 321
3 vs 21
2 vs 1

Question 7

Planned comparison - helmert

Answer 7

Compares the effect of each condition to the overall effect of all following conditions
1 vs 234
2 vs 34
3 vs 4

Question 8

Planned comparison - repeated

Answer 8

Compares the effect of each condition to the next condition
1 vs 2
2 vs 3
3 vs 4