A football coach claims that players can increase their strength by taking a certain supplement. To test thetheory, the coach randomly selects 9 athletes and gives them a strength test using a bench press. The results arelisted below. Thirty days later, after regular training using the supplement, they are tested again. The newresults are listed below. Test the claim that the supplement is effective in increasing the athletesʹ strength. Use α= 0.05. Assume that the distribution is normally distributed. $$\begin{array} { l | c c c c c c c c c }
\text { Athlete } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 \
\hline \text { Before } & 215 & 240 & 188 & 212 & 275 & 260 & 225 & 200 & 185 \
\hline \text { After } & 225 & 245 & 188 & 210 & 282 & 275 & 230 & 195 & 190
\end{array}$$

Question

A football coach claims that players can increase their strength by taking a certain supplement. To test thetheory, the coach randomly selects 9 athletes and gives them a strength test using a bench press. The results arelisted below. Thirty days later, after regular training using the supplement, they are tested again. The newresults are listed below. Test the claim that the supplement is effective in increasing the athletesʹ strength. Use α= 0.05. Assume that the distribution is normally distributed. $$\begin{array} { l | c c c c c c c c c } 
\text { Athlete } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 \
\hline \text { Before } & 215 & 240 & 188 & 212 & 275 & 260 & 225 & 200 & 185 \
\hline \text { After } & 225 & 245 & 188 & 210 & 282 & 275 & 230 & 195 & 190
\end{array}$$

Quizplus · Accepted Answer

The Answer of A football coach claims that players can increase their strength by taking a certain supplement. To test thetheory, the coach randomly selects 9 athletes and gives them a strength test using a bench press. The results arelisted below. Thirty days later, after regular training using the supplement, they are tested again. The newresults are listed below. Test the claim that the supplement is effective in increasing the athletesʹ strength. Use α= 0.05. Assume that the distribution is normally distributed. $$\begin{array} { l | c c c c c c c c c } 
\text { Athlete } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 \
\hline \text { Before } & 215 & 240 & 188 & 212 & 275 & 260 & 225 & 200 & 185 \
\hline \text { After } & 225 & 245 & 188 & 210 & 282 & 275 & 230 & 195 & 190
\end{array}$$

A Football Coach Claims That Players Can Increase Their Strength