A school wanted to study the effect of offering after-school peer tutoring in hopes that the tutoring would increase the student's GPA (grade point average). The students with the 100 lowest GPAs were randomly assigned to groups. Sample 1 received tutoring, Sample 2 did not. At the end of the study the GPA of the students was recalculated. The results are below. Use an alpha of 0.05 to determine if the tutoring did have a higher proportion of students with an improved GPA. Improved GPA CPA unchanged or lowered Sample 1 (tutoring) 31 50 Sample 2 (no tutoring) 5 50 For your convenience, Confidence Level Critical -score 90% 0.05 1.645 0.10 95% 0.025 1.96 0.05 99% 0.005 2.576 0.01 The null hypothesis is not rejected. The null hypothesis is rejected in favor of . The null hypothesis is rejected in favor of The null hypothesis is rejected in favor of