What would the degrees of freedom be for the Chi-Square test with a contingency table with 5 rows and 4 columns  a.8 b.20 c.12 d.9

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.8: Probability
Problem 20E
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What would the degrees of freedom be for the Chi-Square test with a contingency table with 5 rows and 4 columns 

a.8
b.20
c.12

d.9 

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