In the United States, there has historically been a strong relationship between

Question

In the United States, there has historically been a strong relationship between smoking and education, with well-educated people less likely to smoke. To examine whether this pattern has changed, a sample of 459 men was selected at random from those who had visited a health center for a routine check-up over the course of the past year. Education is classified into three categories corresponding to the highest level of education achieved, and smoking status is classified into four categories. The degrees of freedom for the chi-square test for this two way table are: A. 7. B. 2. C. 6. D. 12

Explanation / Answer

as we know degree of freedom =(number of rows-1)*(number of columns-1) =(3-1)*(4-1) =6

therefore option C is correct

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