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A researcher tested the diastolic blood pressure of15 marathon runners and15 non-runners. The mean for the runners was 75.9 mm Hg with an SS of

  1. A researcher tested the diastolic blood pressure of15 marathon runners and15 non-runners. The mean for the runners was 75.9 mm Hg with an SS of 1,500, and the mean for the nonrunners was 80.3 mm Hg with an SS of 8. Is running a good way to lower a person's blood pressure?
    1. Test the null hypothesis at the .05 level

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