2/10/2016

Chapter 7 - Measures of Variability

• Use SRIS applet to compare the standard deviations or variances
• Example - Exercise 33 on p. 258 - Back to Coors Field
  • Open P:\Data\MATH\Hartlaub\SportsStats\SRIS Data\Chapter 7\Ex7-33.mtw
  • Create a boxplot to compare the two distributions
  • How do we decide which distribution is more consistent?
  • Cautionary Remark - This test is very sensitive to outliers.
  • Challenge - can you get R to conduct an appropriate test for two variances or two standard deviations?

Reading Assignment - Please complete your reading of Chapter 7 for Class on Friday and read Chapter 8 for class on Monday.

Professor Milnikel will step you through an acitivity on Friday to help you understand standard deviation and variance, and then you will take Quiz #2. The Quiz will cover Chapters 5, 6, and 7.