A football coach claims that players can increase their strength by taking a certain supplement. To test the theory, the coach randomly selects 9 athletes and gives them a strength test using a bench press. The results are listed below. Thirty days later, after regular training using the supplement, they are tested again. The new results are listed below. Test the claim that the supplement is effective in increasing the athletes strength. Use the significance level= 0.05. Assume that the distribution is normally distributed. include TI 84 commands

Athlete Before After

1 215 225

2 240 245

3 188 188

4 212 210

5 275 282

6 260 275

7 225 230

8 200 195

9 185 190