1. No. You may run a class with one student.
2. Given the significant hands on component, I prefer to limit the upper number of students to 4 or 5 absolute max to ensure a quality learning, assessment, and feedback experience for each student. As far as an optimum certain number of students, it is highly variable. I think it is up to the Instructor to dynamically create optimum learning, assessment, and feedback experiences for each individual student as well as the class as a whole, regardless of either the class size or the relative knowledge/experience levels of the students in the class.
3. What are your thoughts?
I have done classes with 1 person, but do not recommend it on a regular basis. NRP is a team sport-therefore you need a team to accurately simulate a resuscitation. 3-4 people is best, but I will do up to 8 and have 2 teams. One watches while the other simulates.
I try to keep it at the recommended 4 participants for 1 instructor. Makes it easier. I have done it with one person before just not ideal learning. I have done classes with max of 6 but that isn't preferred. I set up our courses with 4 people for 2 hours every 30 minutes and run 5 instructors. one for each performance skill station which is 20 minutes long (PPV/Pulse Ox/Oxygen, Intubation/LMA, CC & Meds) then an hour long Integrated skill station. so people come at 10, 1030,11, 1130, 12 and so on depending on sign ups for the month. Best way I could manage a large number of students to all come in one day. We will routinely have 25 people in class but sometimes up to 40 depending on month.