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An investigator wants to estimate the mean systolic blood pressure in children with congenital heart disease who are between the ages of 3 and 5.

An investigator wants to estimate the mean systolic blood pressure in children with congenital heart disease who are between the ages of 3 and 5. How many children should be enrolled in the study? The investigator plans on using a 95% confidence interval and wants a margin of error of 5 units. The standard deviation of systolic blood pressure has been relatively steady at 20 units

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