Question: During a specific year, 200 cardiac catheterization procedures were performed on persons over 70 years of age at a large university hospital. From the list

During a specific year, 200 cardiac catheterization procedures were performed on persons over 70 years of age at a large university hospital. From the list of these patients, 4 systematic samples of 1 in 50 patients yielded the data on the next page relating to pulmonary artery pressure.

Based on these preliminary data, how many repeated systematic samples of 1 in 50 persons would have to be taken in order to estimate the mean pulmonary artery pressure in this population to within 10% of the true mean?

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