The following shows the monthly sales in units of six salespersons before and after a bonus plan was introduced. At 95% confidence, determine whether the bonus plan has increased sales significantly. (For the following matched samples, let d = After - Before.) $\begin{array}{ll}
\text { Salesperson }&\text { After } & \text { Before } \
1&94 & 90 \
2&82 & 84 \
3&90 & 84 \
4&76 & 70 \
5&79 & 80 \
6&85 & 80
\end{array}$

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The Answer of The following shows the monthly sales in units of six salespersons before and after a bonus plan was introduced. At 95% confidence, determine whether the bonus plan has increased sales significantly. (For the following matched samples, let d = After - Before.) $\begin{array}{ll}
\text { Salesperson }&\text { After } & \text { Before } \
1&94 & 90 \
2&82 & 84 \
3&90 & 84 \
4&76 & 70 \
5&79 & 80 \
6&85 & 80
\end{array}$

The Following Shows the Monthly Sales in Units of Six