A researcher wants to conduct a study to determine whether a newly developed antidrug program is successful. Two randomly selected groups of 250 students each, identified as control and treatment groups, are formed from the 500 students accused of using drugs. Both groups receive a set of antidrug materials and a lecture from a teacher and an ex-drug user about the dangers of drug use. In addition, the treatment group also receives materials from the newly developed program. One hundred forty-eight of the 250 students in the control and 175 of the 250 students in the treatment group no longer use drugs is recorded 9 months later. Use the results to test the hypotheses H0: P1 = P2 and Ha: P1 * P2 where P1 represents the proportion of students who succeed in the control program and p2 represents the proportion of students who succeed in the newly developed program.

What can you conclude using the significance level a = 0.05?