3 29 Attractive instructors A psychologist claims that stu dents are more attentive in classes taught by instruc tors rated as attractive by students than in classes with instructors rated as unattractive He surveys students in classes taught by instructors rated as attractive and in classes taught by instructors rated as unattractive The proportion of students claiming to be highly at tentive in class is significantly higher P 0 05 among students with attractive instructors What additional in formation would you want to help you decide whether you believe the psychologist s claim