Additional Things to Know:

• Calculate the Standard errors of estimate for your prediction, slope, and intercept.
  
  
• Tests for significance between correlations, slopes, and intercepts of different data sets.
  
  
• Binomial Effect Size displays instead of r² to see how useful your r is.
  
  
• Multiple Regression - Why just have one predictor X - you can have more. Why not predict GPA from SAT and your number of siblings so: