Cynthia Cardiac, health researcher for the National Heart Institute, believes that moderate exercise after heart attacks will help reduce high blood pressure. She knows that heart attack victims have an average blood pressure of 204 over 140. The top number is her concern. She randomly selects 35 recent heart attack victims and has them swim for 30 minutes three times a week. After six months she takes the blood pressure of this group and finds a mean of 190 with a standard deviation of 45. Present a hypothesis, a null hypothesis, and evaluate the hypothesis. Could the average blood pressure of this group be as low as 180?
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