An auditor used a nonstatistical sampling plan to audit the inventory of an auto supply company. The auditor tested the recorded cost of a sample of inventory items by reference to vendors' invoices. In performing the test, the auditor verified all the items on two pages selected at random from the client's 257-page inventory listing. The sampling plan resulted in a test of $50,000 of the total book value of $5,000,000, and the auditor found a total of $5,000 in overstatements in the sample. Since the senior indicated that the amount of a material misstatement in the inventory account was $100,000, the auditor concluded that the recorded inventory value was materially correct.
Evaluate the auditor's sampling plan and the manner in which the results were evaluated.