Golf Ball
a New Golf Ball Has Been Designed to Improve

Golf ball
A new golf ball has been designed to improve driving distance off the tee when compared to their market competitor.To test their new ball,nine golfers hit a drive with the current ball and then hit another drive with the new ball.The distance in yards for each golfer is shown in the following table.
$$\begin{array} { | c | c | } \hline \begin{array} { c } \text { Current Golf Ball } \\\text { (Pupulation 1) }\end{array} & \begin{array} { c } \text { New Golf Ball } \\\text { (Population 2) }\end{array} \\\hline 212 & 215 \\\hline 236 & 228 \\\hline 250 & 256 \\\hline 243 & 264 \\\hline 250 & 248 \\\hline 235 & 255 \\\hline 230 & 239 \\\hline 225 & 218 \\\hline 220 & 239 \\\hline\end{array}$$
-Use $\alpha$ = 0.05.State the decision rule in terms of the critical value.