I'm doing a survey for my class assignment. I have a question, if we survey everyone in a cluster, we are preventing bias right?
My cluster is a classroom in our school. Do I need to survey each person in the class? My teacher said that I can survey each person, or sample a group within the class. But if I take sample, than the result might be biased right?
I will have to spend more time and it will be harder to survey everyone in the class. But I also want to have the best result. Which should I do?