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Unformatted text preview: Math 127B, Notes for lecture 16 Mrinal Raghupathi Wednesday, March 23rd, 2011 Administrivia Today we will discuss the χ 2 test for independence. We are skipping chapter 24.3. Reminders 1. Homework 8 is due Thursday, 3/24 in recitation. 2. Quiz in recitation over chapter 27 on 3/24. 3. This week’s recitation will be a discussion of problems from chapter 28. 4. Exam 2 review session is on Monday inclass. Bring questions. 1 The χ 2test for independence The test is best demonstrated through an example. The following data was collected from a sample of 299 people in the state of Wyoming. Everyone in the sample was between 25 and 34 years old, and there were 143 men and 156 women in the sample. The data seems to indicate that there is a difference in the marital status of men and women. Men Women Never Married 31.5% 19.2% Married 60.1% 67.3% Widowed, divorced, or separated 8.4% 13.5% The question is whether this difference is chance error. The null hypothesis would say that it is not chance error and that sex and marital status are independent. How do we convert this to ais not chance error and that sex and marital status are independent....
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This document was uploaded on 10/29/2011 for the course MATH 127B at Vanderbilt.
 Spring '11
 Staff
 Math, Statistics

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