The Table Below Shows the Weights of Seven Subjects Before

Essay

The table below shows the weights of seven subjects before and after following a particular diet for two months. $$\begin{array} { c | c c c c c c c } \text { Subject } & \text { A } & \text { B } & \text { C } & \text { D } & \text { E } & \text { F } & \text { G } \\\hline \text { Before } & 156 & 196 & 152 & 182 & 172 & 167 & 200 \\\hline \text { After } & 149 & 187 & 150 & 187 & 158 & 169 & 188\end{array}$$ Do the data suggest that,on average,the diet is effective in reducing weight? Perform a paired $\text { t-test }$ at the 1% significance level.