A professor use chi-square test to examine the relationship between smoking and colon cancer. He followed a total of 480 people and the result was listed below. How many degrees of freedom are there in this table?

A professor use chi-square test to examine the relationship between smoking and colon cancer. He followed a total of 480 people and the result was listed below. How many degrees of freedom are there in this table?

Algebra & Trigonometry with Analytic Geometry

13th Edition

ISBN:9781133382119

Author:Swokowski

Publisher:Swokowski

Chapter10: Sequences, Series, And Probability

Section10.8: Probability

Problem 32E

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Question

A professor use chi-square test to examine the relationship between smoking and colon cancer. He followed a total of 480 people and the result was listed below. How many degrees of freedom are there in
this table?
No Colon
Total
Frequency
Colon Cancer
Cancer
Smokers
120
80
200
Non-smokerS
25
255
280
Total
145
335
480
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