Chi-square test. FPP 28. More types of inference for nominal variables. Nominal data is categorical with more than two categories Compare observed frequencies of nominal variable to hypothesized probabilities One categorical variable with more than two categories
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Pr (within 7) = = .0411 Pr (8 - 30) = = .1260 Pr (31-90) = = .3288 Pr (91+) = = .5041
Baldness Disease Number of people
None Yes 251
None No 331
Little Yes 165
Little No 221
Some Yes 195
Some No 185 Combine “extreme” and “much” categories
Much Yes 50 Much or extreme Yes 52
Much No 34 Much or extreme No 35
Extreme Yes 2
Extreme No 1
This changes the question slightly, since we have a new category.