WILCOXON MANN WHITNEY U (TWO INDEPENDENT SAMPLES) A clinical trial is run to assess the effectiveness of a new anti-retroviral therapy for patients with HIV. Patients are randomized to receive a standard anti-retroviral therapy (usual care) or the new anti-retroviral therapy and are monitored for 3 months. The primary outcome is viral load which represents the number of HIV copies per milliliter of blood. A total of 30 participants are randomized and the data are shown below. Standard Therapy New Therapy 7400 400 7900 1500 1900 250 900 900 9000 2150 6700 920 3300 5900 820 940 1700 570 2000 300 5400 4000 1300 Is there statistical evidence of a difference in viral load in patients receiving the standard versus the new anti-retroviral therapy?

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