According to IIA guidance, which of the following is true regarding audit supervision?
1. Supervision should be performed throughout the planning, examination, evaluation, communication, and follow-up stages of the audit engagement.
2. Supervision should extend to training, time reporting, and expense control, as well as administrative matters.
3. Supervision should include review of engagement workpapers, with documented evidence of the review.

In a review of an electronic data interchange application using a third-party service provider, the auditor should:
I. Ensure encryption keys meet International Organization for Standardization (ISO) standards.
II. Determine whether an independent review of the service provider's operation has been conducted.
III. Verify that only public-switched data networks are used by the service provider.
IV. Verify that the service provider's contracts include necessary clauses, such as the right to audit.

Which of the following attribute sampling methods would be most appropriate to use to measure the total misstatement posted to an accounts payable ledger?

Which of the following statements concerning workpapers is the most accurate?

The internal auditor of a bank has developed a multiple regression model which has been used for a number of years to estimate the amount of interest income from commercial loans. During the current year, the auditor applies the model and discovers that the R2 value has decreased dramatically, but that the model otherwise seems to be working correctly. Which of the following conclusions is justified by the change?