HOME-STUDY DRIVER EDUCATION
Safe-Driving Attitude Comparisons
The mean safe-driving attitude scores of the instruction methods for students correctly assigned and not enrolled in driver training are presented in Figure 2. The results did not indicate any statistically significant differences in the safe driving attitudes of students completing the home-study courses compared to those completing classroom instruction, or between any of the home-study courses (ps > .05).
MEAN CPI ATTITUDE SCORE
80 70 60 50 40 30 20 10 0
PEN CD-ROM DRIVER EDUCATION COURSE
Figure 2. Mean safe-driving attitude score by instruction method for students correctly assigned to the courses and not enrolled in driver training.
DMV Written Knowledge Test Pass Rate Comparisons
The first-attempt DMV written knowledge test pass rates of the instruction methods for students who were properly randomly assigned and were not enrolled in driver training are shown in Figure 3. The findings indicate that the students who completed classroom instruction passed the written test at a significantly higher rate on their first attempt than did students in either the CD or workbook courses. The fact that the observed 12.4% lower pass rate for PEN students compared to classroom students was not statistically significant is quite possibly a result of low power due to the small sample size of PEN students (n = 44) used in this comparison, rather than there being no true difference between the groups’ performances on the written test. Statistical power refers to the ability to detect a difference between the means when the difference actually does exist.