A physical education director claims by taking a special vitamin, a weight lifter can increase his strength. Eight athletes are selected and given a test of strength, using the standard bench press. After 2 weeks of regular training, supplemented with the vitamin, they are tested again. Test the effectiveness of the vitamin regimen at ? = 0.05. each value in these data represents the maximum number of pounds the athlete can bench press. Assume the variable is approximately normally distributed.

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