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13.6 Testing Categorical Probabilities: Two-Way (Contingency) Table

Use the table below, which is from a study on heart disease and smoking, and a 0.005 significance level to test if smoking and heart disease are related.
Risk Factor      Heart Disease          No Heart Disease            Total
Smoker                    25                                   10                                35
Nonsmoker            14                                    51                                65
Total                         39                                    61                              100


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