Consider an experiment to determine the effects of alcohol and marijuana on driving ability with Alpha= .05. Fifteen participants were randomly assigned to have alcohol, marijuana, or neither, and were then tested in a driving simulator. The results of the test (scored from 0 to 10) are as follows:
| Alcohol |
Marijuana |
Control |
| 4 |
6 |
7 |
| 1 |
4 |
8 |
| 3 |
3 |
6 |
| 1 |
4 |
5 |
| 3 |
1 |
8
|
a. List the null and alternate hypothesis
b. Calculate the appropriate statistic.
c. Do you reject or fail to rejet the null? Why?
d. Write an APA style conclusion,
e. Calculate the effect size for this relation.