In a study of teen cell phone use, 117 high school students were observed as they drove out of their high school parking lot after school. Of these drivers, 46 were already talking on their cell phones as they drove out. What is the most probable purpose of this study?
A) To find out what percent of high school students have cell phones.
B) To find out what percent of cell phone users are high school students.
C) To find out what percent of high school students use cell phones while driving.
D) To find out what percent of high school students with cell phones drive cars to school.

Question

Quizplus · Accepted Answer

The study observed high school students as they drove out of their high school parking lot after school, and counted the number of students who were already talking on their cell phones as they drove out. This suggests that the purpose of the study was to find out what percent of high school students use cell phones while driving.

In a Study of Teen Cell Phone Use, 117 High