THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION

Essay

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
An auditor is faced with reviewing 1,294 invoices.From a random sample of 122 of these accounts,she found that the average amount was $639 with a standard deviation of $143.She also found that 37 out of the 122 in the sample were from out-of-state suppliers.
-Find a 95% confidence interval for the proportion of all invoices that are from out-of-state suppliers.