There is a notion that early discrimination training increases the IQ of children; that is, color discriminations (particularly subtle ones), discriminations among musical tones, etc., if fostered in children, are expected to increase IQ. A group of identical twins is used in an experiment to test this theory. One member of each twin pair gets this early discrimination training, but the other does not. Then, at a later date, their respective IQ scores are obtained. Which statistic would be used to test the hypothesis? 1. Point Biserial r
2. Z-test
3. Eta-squared
4. Dependent groups t-test
5. One Sample t-test
6. r-squared or r
7. Two factor ANOVA
8. Independent groups t-test
9. Phi Coefficient
10. Chi-square test
11. t-test for r > 0
12. One Factor ANOVA
13. Cramer’s Phi