12. A school has been gathering information about drug use in its student body by asking students to identify (by first initial only) their ten closest friends or associates at school and then indicate how many of these ten have used illegal drugs in the past 6 months. The school has been conducting such surveys for a number of years, and the results have always been about the same: = 3.4 and = 1.5. This year the school has begun a "Just say NO" campaign and the administration would like to know whether it has been effective. Perhaps it has increased drug use, perhaps it has decreased it, or perhaps it has had no significant effect. The administration conducts the survey again. (a) State the null and alternative hypotheses b) Are these hypotheses directional or nondirec-tional? Why? (c) State in plain English what a Type I error would be in this situation. (d) State in plain English what a Type II error would be in this situation