A researcher is interested in the effects of birth order (only child versus first born versus later born) on achievement in a group of middle school Right-handed and Left-handed children. The researcher believes that birth order has a differential effect on achievement in Right-handed and Left-handed children.Data were collected on a standardized test taken by all students (both Right-handed and Left-handed children) in the 8th grade (higher scores indicate greater achievement).The data are given below:
Birth Order Only First Later
|
1 |
8 |
15 |
|
Right-handed 2 |
9 |
16 |
|
3
|
10 |
17 |
|
4 |
11 |
27 |
|
Left-handed 5 |
12 |
28 |
|
6 |
13 |
29 |
Perform the appropriate analysis. Follow up any main effects with Scheffe’s follow-up tests.
Describe the findings fully, including an analysis of the interaction using Simple Effects follow-up tests.
Was the researcher’s hypothesis supported?
