The percentage of patients overdue for a vaccination is often of interest for a medical clinic. Some clinics examine every record to determine that percentage; in a large practice, though, taking a census of the records can be timeconsuming. Cullen (1994) took a sample of the 580 children served by an Auckland family practice to estimate the proportion of interest. What sample size in an SRS (without replacement and with fpc adjustment) would be necessary to estimate the proportion with 95% confidence and margin of error 0.15? Use the maximum possible value of ?2.
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