Adriving school wants to find out which of its two instructors is more effective at preparing students to pass the state’s driver’s license exam. an incoming class of 100 students is randomly assigned to two groups, each of size 50. one group is taught by instructor a; the other is taught by instructor b. at the end of the course, 30 of instructor a’s students and 22 of instructor b’s students pass the state exam. do these results give convincing evidence that instructor a is more effective? a driving school wants to find out which of its two instructors is more effective at preparing students to pass the state’s driver’s license exam. an incoming class of 100 students is randomly assigned to two groups, each of size 50. one group is taught by instructor a; the other is taught by instructor b. at the end of the course, 30 of instructor a’s students and 22 of instructor b’s students pass the state exam. do these results give convincing evidence that instructor a is more effective?