An auditor desired to test credit approval on 10,000 sales invoices processed during the year.

The auditor designed a statistical sample that would provide 1% risk of assessing control risk too low (99% confidence) that not more than 7% of the sales invoices lacked approval. The auditor estimated from previous experience that about 2 % of the sales invoices lacked approval. A sample of 200 invoices was examined and 7 of them were lacking approval. The auditor then determined the achieved upper precision limit to be 8%.

The allowance for sampling risk was:

a. 5 %

b. 4 %

c. 3 %

d. 1 %

e. 1%