Homework - Statistical Inference

Basically, there are two kinds of fixes here.
1. ".html and .md" -  I didn't know how to use slidify in my previous pull request, so even though the .Rmd files were fixed and my pull request was merged, the .html and .md files were unfixed.  To solve this, I installed the slidify package and knit the .Rmd files.
2. "hw3.Rmd"  - There were a few typos leading to wrong answers.  Also, one of the slides had two questions and one answer, so I made that more clear.