1. Statistics 350 Lecture 8

2. Today Last Day: Finish last day Today: Old Faithful, Start Chapter 3

3. Overview of Diagnostics Have assumed that the simple linear regression model holds The assumptions of this model can be violated in a number of ways:

4. Independence Model assumes that are independent Says nothing about the X i ’s…just fixed constants What is have extreme value X j ?

5. Independence Exptreme point can determin where the regression line will go? If model is correct is this bad What often happens with extreme points? Good idea to use box-plot to identify extreme values

6. Independence