1/28/2013

Comments on Minute Card

• Extrapolation - Using the least squares line for prediction outside the range of data used to compute the least squares line.
• Typical residual plot
• Pace of the course
• Using Minitab for HW and in class

Regression Activities

• Questions on Kenyon Tuition activity
• Anscombe's data
• Nonlinear Regression (p:\data\math\stats\alligator.mtw)

Association versus Causation

• Polio Vaccine
  • Before the introduction of the Salk vaccine, investigators looked at the relationship between the incidence of polio and the number of soft drinks sold.  A strong positive correlation between the number of soft drinks sold per week and the number of new cases of polio reported was detected.  What does this tell you?
• Establishing Cause and Effect Relationships
  • The best method of establishing causation is to conduct a carefully designed experiment in which the effects of possible lurking variables are controlled.

Please complete your reading of Chapter 2 for class on Wednesday.