The number of degrees of freedom in a test of a contingency table with 7 rows and 5 columns is: $\begin{array}{|l|l|}
\hline\text { A. } & 24 . \
\hline \text { B. } & 35 . \
\hline \text { C. } & 30 . \
\hline \text { D. } & 28 . \
\hline
\end{array}$

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The Answer of The number of degrees of freedom in a test of a contingency table with 7 rows and 5 columns is: $\begin{array}{|l|l|}
\hline\text { A. } & 24 . \
\hline \text { B. } & 35 . \
\hline \text { C. } & 30 . \
\hline \text { D. } & 28 . \
\hline
\end{array}$

The Number of Degrees of Freedom in a Test of a Contingency