What is an auditor’s evaluation of a statistical sample for attributes when a test of 50 documents results in 3 deviations if the tolerable rate is 7%, the expected population deviation rate is 5%, and the allowance for sampling risk is 2%?
Modify the assessed risk of material misstatement because the sample deviation rate plus the allowance for sampling risk exceeds the tolerable deviation rate.
The sample has a 6% (3 ÷ 50) deviation rate. The auditor’s achieved upper deviation limit is 8% (6% + the 2% allowance for sampling risk). The allowance for sampling risk may be calculated from a standard table as the difference between the upper deviation limit and the sample rate. However, the allowance is given. Thus, the true deviation rate could be as large as 8% and exceed the tolerable rate. Accordingly, the auditor should revise the assessed risk of material misstatement for the relevant assertions and possibly alter the nature, timing, and extent of substantive procedures.