Psyc212/667 Practice Problems: Answers
Psyc212/667 Practice Problems:
Answers
11.
SxA
| Source | Sums of
Squares | df | Means Squares | F |
|---|
| Total | 581-992/20 = 90.95 | 20-1=19 | --- | --- |
|---|
| Between Subjects |
(202+212+252+162+172)/4
- 992/20 = 12.70
| s-1=4 | ---
| --- |
|---|
| Within |
Total-Between = 78.25
| N-s=15 | ---
| --- |
|---|
| A |
(172+142+332+352)/5
- 992/20 = 69.75
| a-1=3 | 23.25
| 23.25/.7083 |
|---|
| SxA(Error) |
Within - A = 8.50
| (s-1)(a-1) = 12 | .7083
| --- |
|---|
If the assumption of equal trial-to-trial correlation had been violated, and Box's epsilon was
.6, the main effect of A would be tested on 1.8, 7.2 degrees of freedom.
12.
S/AxB
| Source | Sums of
Squares | df | Means Squares | F |
|---|
| Total | 656 - 1442/36 = 80 | 36-1 | --- | --- |
|---|
| Between Subjects |
(72+112+112+162+...132)/3
- 1442/36 = 24.67
| 12-1 | ---
| --- |
|---|
| A |
(452+452+542)/12
- 1442/36 = 4.5
| 3-1 |
2.25 | 2.25/2.24 |
|---|
| S/Aerror |
Between-A =24.67-4.5 =20.17
| a(n-1)=3(4-1) | 2.24
| --- |
|---|
| Within |
Total - Between = 80-24.67=55.33
| 35-11=24 | ---
| --- |
|---|
| B |
(582+442+422)/12
- 1442/36 = 12.67
| 3-1 |
6.33 | 6.33/.935 |
|---|
| AxB) | (142+162+152...+132)/4 -
1442/36 - 4.5 - 12.67 = 25.83 | (a-1)(b-1) = (3-1)(3-1) | 12.92 | 12.92/.935 |
|---|
| S/AxBerror | 55.33 - 12.67 - 25.83 = 16.83
| a(n-1)(b-1) = 3(4-1)(3-1) | .935 |
--- |
|---|