two more Statistical Stories

We've been more or less through the Handball story (Who wins?, v.6) and the Football story (the Turn-around operation, v.7). After having started Ch3, with the basics of the linear regression model, including prediction, work through as much as you can for Stories iv.1 (New Haven temperatures) and iv.3 (How special are You?). 

I'll put the relevant curated datasets on the course site (the first: temperatures and years; the second: weight-of-body and weight-of-brain for 56 mammals) pretty soon.