Two research laboratories have independently produced drugs that provide relief to arthritis sufferers. The fi rst drug was tested on a group of 90 arthritis sufferers and produced an average of 8.5 hours of relief, and a sample standard deviation of 1.8 hours. The second drug was tested on 80 arthritis sufferers, producing an average of 7.9 hours of relief, and a sample standard deviation of 2.1 hours. At the 0.05 level of signifi cance, does the second drug provide a signifi cantly shorter period of relief?

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