Problem 8.4. Pulmonary vascular resistance (PVR) occurs when the pul- monary art

Question

Problem 8.4. Pulmonary vascular resistance (PVR) occurs when the pul- monary artery creates resistance against the blood flowing into it from the left ventricle. An elevated PVR is frequently observed in patients with ad- vanced heart failure. We have n = 30 patients with heart failure associated to left ventricular dysfunction. The sample mean and sample standard de- viation of the PVR for these 30 patients are 234.6 dyn-sec-cm5 and 137.5 dyn-sec-cm-, respectively. Assume that the PVR for these patients is nor- mally distributed. Give a 95% confidence interval for the mean PVR for patients with heart failure associated to left ventricular dysfunction.

Explanation / Answer

CI for 95% n 30 mean 234.6 z-value of 95% CI 1.9600 std. dev. 137.5 SE = std.dev./sqrt(n) 25.10395 ME = z*SE 49.20284 Lower Limit = Mean - ME 185.39716 Upper Limit = Mean + ME 283.80284 95% CI (185.3972 , 283.8028 )

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