The internal auditing staff of a local manufacturing company performs a sample audit each quarter to estimate the proportion of accounts that are delinquent (more than 90 days overdue). For this quarter, the auditing staff randomly selected 400 customer accounts and found that 80 of these accounts were delinquent. What is themargin of errorfor a 95 percent confidence interval for the proportion of all delinquent customer accounts at this company?

What is the Margin of Error?