This question is between statistics and the academic part, specifically in the field of education. The thing is that for a couple of years we have been using a methodology for teaching a course for the undergraduate level; the number of students who passed the course was approximately 90% in classrooms composed of 25 to 30 students.
A problem arise when a new lecturer arrived and he proposed an alternative methodology for teaching the course, and I and other colleague hypothesize that with this new methodology the number of people who will fail the course will be pretty high. We tested the new methodology in a group of 30 students and the results were that most of the classroom failed the course; the p-value obtained was 0.018.
The question here is how to present these results on a report? One criticism that we got is that a sample of 30 students is too small.