Reading: 

• Freedman et al. Chapters 10, 11 and 12 (in reader)

Stata:

• STATA program (t-test.do)  
• Data (auto.dta) (grades.dta)

Links from the slides:

Student's t: http://econtools.com/jevons/java/Graphics2D/tDist.html

Effect size (Cohen's d) calculator: http://www.uccs.edu/~faculty/lbecker/