A study was conducted to test the effect of moderate alcohol consumption on driving performance. During the first trial, the ten subjects were asked to drive a car through a challenging maze of orange cones. The number of cones touched or run over was recorded. One hour later, these same subjects were given two glasses of wine to drink. Following the consumption of the wine, the subjects traversed the same course they had previously. The number of cones touched or run over was again recorded. Compute the appropriate test to determine if the alcohol affected driving ability.

Pretest	Posttest
7	12
7	6
9	10
5	7
3	5
3	5
2	6
6	3
6	9
8	9

1. What is the null hypothesis in this study?
2. What is the alternate hypothesis?
3. What probability should you use and why?
4. What are the degrees of freedom?
5. What is your computed answertvalue?
6. Based on yourtvalue, probability level, degrees of freedom, and critical value, is there a significant difference between the two groups?
7. Interpret your answer--are there differences between the pre- and post-test scores? If so, which group performed better? interpretation as a press release for a local paper (i.e., explain the results in everyday language to an audience not familiar with statistics and research design).
8. If you have made an error, would it be a Type I or a Type II error? Explain.