Sampling:

Assume you are auditing cash payments for Briscoe Group Ltd. Briscoe Group Ltd deals with several very large suppliers who expect payment by electronic funds transfer within three business days of delivery. Other large suppliers will accept cheques or electronic funds transfer on terms of 14 days, and small suppliers receive cheques with payment terms of 30 days. Other regular large cash payments include wages (weekly by electronic funds transfer from a wages account), utilities (electricity accounts are paid monthly by cheque), cleaning (paid monthly by cheque) and rent (paid monthly by electronic funds transfer). In addition, there are irregular payments for items such as maintenance, fixtures purchase and lease, and vehicle running costs.

All cash payments are processed in the central office after the required set of documents has been assembled and checked by two junior accounts staff. Payments are authorised by a senior accountant and electronic funds transfer authorities and cheques are countersigned by the chief accountant (except if he is on leave when another member of the accounts staff performs this task). Journals and ledgers are maintained by staff not involved in cash payment processing.

You need to test controls over cash payments and have planned to make extensive use of sampling.

Matters to be addressed in the presentation:

What population(s) would be relevant to your control testing?

Explain the potential implications of sampling risk for the audit of cash payments.

What possible non-sampling risks exist in this case?

I have seen the answer for this on your site but for the test of controls etc - can you provide more detail of the risks/What can go wrongs and the related assertions that the control addresses please. and ways the control can be tested