The decision support system analyst has been asked to prepare

an estimate of the percentage of time that a lab technician spends on

microscopic examination of blood cultures, with a 95.5 percent

confidence level. Past experience indicates that the proportion will be

25 percent.


. What sample size would be appropriate to have an error of no

more than 4 percent?


. If a sample of three hundred is used, what would be the potential

error for the estimate?