Question

A quality-conscious disk manufacturer wishes to know the fraction of disks his company makes which are defective. In an earlier study, the population proportion was estimated to be 0.13. How large a sample would be required in order to estimate the fraction of disks produced which are defective at the 95% confidence level with an error of at most 0.02? Round your answer up to the next integer.

Answer 1

here we use formula of margin of error for population proportion.