Updated hw3.Rmd to fix Q2(hint and answer) and  Q3(typo)
Merge pull request #18 from mmulchandani/master

Updated hw3.Rmd to fix Q2(hint and answer) and  Q3(typo)
Merge branch 'master' of github.com:bcaffo/courses
Commiting a bunch of minor stuff
Fixed 01_02 to be a lower level lecture