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?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.1: Measures Of Center

Problem 23PFA

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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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