Lecture 19S

Lecture 19S - Lecture 19 page 1 Statistics 371-001, Sp 09...

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Statistics 371-001, Sp 09 Lecture #192 02 April 09 Chapter 10. Analysis of Categorical Data (continued) Skipping 10.4 5. The r x k Contingency Table The 2 x 2 contingency table was introduced in 10.2 and 10.3. The r x k contingency table is very similar to but an expansion of the 2 x 2 table using the Chi- square statistic. The r x k contingency table encompasses variables that have more than 2 rows and/or columns. Hypothetical problem: Random sample of 350 upper class students at UW-Madison. Are drinking and smoking habits related in this group? Drinking Habit: None, Social, Heavy Smoking Habit: None, Light, Moderate, Heavy Step 1. State the hypothesis H 0 : The distribution of drinking habit is the same in the four populations of smokers. H A : The distribution of drinking habit is not the same in the four populations of smokers. H 0 : Pr{None-D|None-S}= Pr{None-D|Light-S}= Pr{None-D|Mod-S}= Pr{NoneD|Heavy-S}. Pr{Social-D|None-S}= Pr{Social-D|Light-S}= Pr{Social-D|Mod-S}= Pr{Social-D|
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Lecture 19S - Lecture 19 page 1 Statistics 371-001, Sp 09...

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