The most accurate results for determining the average number of hours students in Noah's school spend studying for math exams would come from surveying random students in the school. This method provides a more representative sample of the entire student population, reducing bias and ensuring a variety of perspectives from different demographics.
The other options—surveying his friends, surveying all the boys in his math class, or surveying students who play football—are all examples of biased sampling methods that do not capture the full diversity of the student body.