bio386, Tue, salary example

Go over salary example. Ask students to follow along. Some students were able to modify my code and apply it to different variables.
The EdX R course also prepared the students for R syntax.

Correlationhttps://class.coursera.org/rprog-032/forum/thread?thread_id=265

Announcement: Skip "program 2 assignment" on Coursera's R course.

youtube:
https://youtu.be/wrM2uA0NGNs