There are a lot of resources to help you learn about statistics and doing them with R, here’s one taught by a guy I know and respect, Roger Peng:
It’s about 3-5 hours/week for 4 weeks. Go put sign yourself up and cruise around Coursera to see what else you might want to learn.
(Update: It’s not totally clear when it’ll be offered next. Check out Roger and pals’ Simply Statistics blog entry about a “simplified” version: http://simplystatistics.org/post/34563838584/computing-for-data-analysis-simply-statistics-edition.)