A bank audited 100 randomly selected transactions of a newly hired cashier and found that all 100 were done correctly. What is the 95% confidence interval for the cashier’s probability of an error? In...

A bank audited 100 randomly selected transactions of a newly hired cashier and found that all 100 were done correctly. What is the 95% confidence interval for the cashier’s probability of an error?

In order to be 95% confident that the incidence of fraud among tax returns is less than 1 in 10,000, how many tax returns would the IRS need to audit at a minimum?