A Coach Uses a New Technique in Training Middle Distance

Essay

A coach uses a new technique in training middle distance runners. The times, in seconds, for 8 different athletes
to run 800 meters before and after this training are shown below.
Does the conclusion that the techniq $$\begin{array} { | r | c c c c c c c c | } \hline \text { Athlete } & \mathrm { A } & \mathrm { B } & \mathrm { C } & \mathrm { D } & \mathrm { E } & \mathrm { F } & \mathrm { G } & \mathrm { H } \\\hline \text { Before } & 115.2 & 114 & 116.4 & 119.8 & 110.9 & 112.4 & 111.5 & 117.3 \\\hline \text { After } & 112.9 & 112.7 & 114 & 120.6 & 109.1 & 109.1 & 107.9 & 113.4 \\\hline\end{array}$$ ue is effective appear to be supported with statistical significance? Does the
conclusion that the technique is effective appear to have practical significance?