Added hw3
Added a fourth hw
fix homework 1 question 1, which basically was missing a negative sign
fixed homework 1 question 1 - another problem
fix homework 2 slide 8 typo.  lower.tail=TRUE changed to FALSE
fix homework 2 slide 12 question - typo with parens and s/100/10
Merge branch 'master' of https://github.com/bcaffo/courses into inference
Merge pull request #4 from TroyOfHelen/master

fix homework 1 question 1, minus sign and concept
test
Fixed the lecture image stuff
Tried to fix the pdf conversion
completing the merge
hw4 added
Fixing the pdf issues
Converting pdfs
Still figuring out the pdf thing
Think that I have it figured out
Converting more pdfs
Added names lectures
Added a utility function for copying files