Mr. Mauk surveyed 50 high school students in his driver-education course to determine how many times most motorists have taken a driver-education course. Which of the following best explains why the results of Mr. Mauk's survey may NOT be valid? F He did not include motorists from other driver-education courses.
G He should have included adults who have taken driver-education courses.
H He should have included taxi drivers in his survey.
J The sample used in his survey may not have been representative of most motorists.​