The Number of Cars Sold by Three Salespersons Over a 3-Month

The number of cars sold by three salespersons over a 3-month period are shown below: $$\begin{array} { | l | c | c | c | } \hline & { \text { Brand of Car } } \\\hline \text { Salesperson } & \text { Brand A } & \text { Brand B } & \text { Brand C } \\\hline \text { David } & 7 & 2 & 6 \\\hline \text { Edward } & 11 & 4 & 8 \\\hline \text { Frank } & 8 & 5 & 3 \\\hline\end{array}$$ Using the 5% level of significance, test for the independence of salesperson and type of product sold.

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