1/27/2020

Chapter 5 - Comparing two means or two medians

• Using R to compare means and medians
• Example - Exercise 3 on p. 176 - Do the noisy crowds in the Metrodome help the Minnesota Vikings play better defense?
  • Discuss different formats for 2-sample data (stacked versus unstacked)
  • t.test(x) - one sample t test
  • t.test(x,y) - two sample t test
  • t.test(x,y, paired=TRUE) - paired t test
  • wilcox.test(x,y) - Wilcoxon rank sum test

In class exercises for Chapter 5

• Use R, SRIS applets, or Statkey to solve Exercises 3, 19, 21, and 23

Reading Assignment - Please read Chapter 6 for class on Wednesday.

Reminder: We will have our first quiz on Friday.