added hw2.pdf -- problem statements.
created solution set, and added solution to problem #1.
added solution for #2.b.
Finished solution to problem #2.
added a solution to question #4.
Added solution to #3.
added outline and some preliminary EDA.
extended analysis to include type variable.
Extended (real data) exposition of avplots. Started simulation study.
added simulation study on the effect of correlation and significance of beta on R^2 increase.
nearly done with simulation study. Need to fix 2.d.
fixed section 2.d).
added addendum to section 2.d).
Fixed explanation in #1.
Merge branch 'hw2'