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. Do the samples meet the requirements for a z-test of two proportions? Improved GPA CPA unchanged or lowered Sample 1 (tutoring) 31 50 Sample 2 (no tutoring) 5 50 Yes, the conditions have been met. No, Sample 2 has only five students with an improved GPA No, the sample sizes are too small. No, random sampling was not used