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A researcher tested the diastolic blood pressure of15marathon runners and15non-runners. The mean for the runners was 75.9 mm Hg with an SSof 1,500, and the

  1. A researcher tested the diastolic blood pressure of15marathon runners and15non-runners. The mean for the runners was 75.9 mm Hg with an SSof 1,500, and the mean for the nonrunners was 80.3 mm Hg with an SSof 8. Is running a good way to lower a person's blood pressure?

a. Test the null hypothesis at the .05level

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