It has been shown that students who score high on Flight Simulation Skills Test also test high on actual flight skill testing before earning their Pilot's license. ABC Flight school offers its students Flight Simulation Skills course in addition to accumulating actual flight time to enhance their flight skills. The owner of ABC Flight School wanted to test whether the Flight Simulation Skills course is effective in raising the test scores. The average score for students who did not take the Flight Simulation Skills Course was 15. Below are scores obtained from a group of students who recently completed the Flight Simulation Skills Course. What do you think about the students who have completed the Flight Simulation Skills Course at ABC Flight School vs. those that did not? Perform a t test, calculate the effect size index.

19 15 18 17 18 20 19 17 16 18 19 20

= 216 2= 3914 sample Mean= 18

1. S_x =S(hat) =

2. Standard error =

3. df = (.5 pt)

4. t_{crit values}(.5 pt)

5. t_obt =

6. d= (.5 pt)

7. Interpretation: Remember to begin with reject or fail to reject...(be sure to use all stat symbols): (3 points)

8. Are you making a possible Type I or Type II error? (.5 pt)