Question

A weight-lifting coach claims that weight-lifters 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.    Thirty days later, after regular training using the supplement, they are tested again.
The results before and after taking the supplement are shown below: Athlete Before 215 240 188 212 175 260 225 200 185 After 225 245 188 210 282 275 230 195 190 Test the claim that the supplement is effective in increasing the athletes' strength, using a significance level of α = 0.05.

Answer 1

H0: The supplement is not effective in increasing the athlete's strength

H1: The supplement is effective in increasing the athlete's strength

Hence accept H0: the supplement is not effective in increasing athlete's strength