14. The sample mean for a recent introductory psychology test was 78, and the sample variance was 9. If a student's z-score--2.0, what was this student's raw test score? 15. If your sense of direction, relative to a sample of college students, gave you a z- score of +1.5, what is your percentile? 6th c. 43rd b. 7th d. 93rd 16. The sample mean for a recent introductory psychology test was 78 and the sample variance was 9. Approximately what proportion of the scores was above 81? a 0.50 c. 0.16 b. 0.68 d. 0.34 17. Calculate the appropriate correlation coefficient for the following data. Participant Reading Speed Number of Books Test Score Read (X) I 9 6 2 16 7 3 24 10 4 12 5 5 5 2 6 18 8 a-0.07 c. 0.49 b. +0.95 d. +0.23