I'm interested to see the process used to answer the question that's already posted at https://www.coursehero.com/tutors-problems/Computer-Science/16482590-Overview-The-Institute-for-Statistics-Education-at-Statisticscom-asks/. In particular, for the computation part of the "This requires computing correlations between all student pairs. For which students is it possible to compute correlations with E.N.? Compute them." step, I'm not seeing in the reading how I do that programmatically (using R). I can develop the answer by hand, but I don't think that's the intent for the question.