An internal auditor is testing, on a sample basis, whether invoices paid between January 1 and December 31 are supported by appropriately approved purchase orders. Over 25, 000 invoices were paid during the fiscal year, which runs from the first of April to the end of March. The auditor sets the acceptable risk of assessing control risk too low at 5% and the tolerable deviation rate at 5%. The internal auditor consults the previous audit and sets the expected population deviation rate at 1%. Sample size (77) is selected from a table and rounded up to 80. No sample deviations were found. The upper deviation limit was 3.7%.
Which of the following statements represents a valid conclusion regarding this information?