Answer
(a).
Work Step by Step
The degree of freedom is the number of rows minus one multiplied by the number of columns minus one, hence: $df=(r-1)(c-1)=(4-1)(2-1)=3$, thus the answer is (a).
The Basic Practice of Statistics 7th Edition
by Moore, David S.; Notz, William I.; Fligner, Michael A.
Published by
W. H. Freeman
ISBN 10:
146414253X
ISBN 13:
978-1-46414-253-6
Chapter 25 - Two Categorical Variables: The Chi-Square Test - Check Your Skills - Page 601: 25.25
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