Alicia decides to conduct a study with 3-levels of Aptitude (IQ) groups ( Low Avg. <85, Avg. 90-110, Superior >125) with 3-levels of treatment:
1. Advanced Primary Reading Program
2. Open Court Reading Curriculum
This is called a 2 Way 3×3 ANOVA design
The statistically significant results are: (p value, ETA2)
-Apt x Trt 0.17,13%
The interaction effect we discussed in class happened when aptitude 2 and aptitude 1 overlapped on the graph. It shows that the students with the highest aptitude do the best given a post hoc significant t-test with middle and low aptitude groups. Also, it shows that the low aptitude group appears to benefit from the first treatment best.
What are the null and alternative hypotheses?