The following is a partial audit program for the audit of sales transactions.
1. Foot the sales journal for one month and trace the postings to the general ledger.
2. Vouch entries in sales journal to sales invoice and shipping document.
3. Review the sales journal for any large or unusual transactions.
4. Examine evidence on sales invoice that the prices were agreed to the approved price list.
5. Examine sales order for evidence of credit approval prior to shipment.
6. Recompute extensions of price and quantities on the sales invoice.

Required
a. Identify which audit procedures can be tested by using attributes sampling.
b. What is the appropriate sampling unit for the tests in part a?
c. List the attributes for testing in part a.
d. Assume an ARACR of 5% and a TER of 7% for tests of controls and 5% for substantive tests of transactions. The EPER for tests of controls is 1.5%, and for substantive tests of transactions it is .5%. What is the initial sample size for each attribute?