For Tues Dec 11

Here's what you should try to get done in OLI before next Tues:

up to screen 84  (through Mod 4: Checkpoint 2)

Mod 4: Designing Studies Introduction Identifying Study Design Causation and Observational Studies  ---- checkpoint 1 Causation and Experiments - Create and Verify Random Samples Experiments with More than One Explanatory Variable Modifications to Randomization Sample Surveys Wrap-Up (Designing Studies)  ---- StatTutor Exercise (depression.xls) ---- checkpoint 2 Summary (Producing Data)