Which of the following types of sampling techniques should an internal auditor use when testing the effectiveness of internal controls?

The internal audit activity can be involved with systems development continuously, immediately prior to implementation, after implementation, or not at all. An advantage of continuous internal audit involvement compared to the other types of involvement is that:

An internal auditor wants to determine whether employees are complying with the information security policy, which prohibits leaving sensitive information on employee desks overnight. The auditor checked a sample of 90 desks and found eight that contained sensitive information. How should this observation be reported, if the organization tolerates 4 percent noncompliance?

An internal auditor is conducting a review of the procurement function and uncovers a potential conflict of interest between the chief operating officer and a significant supplier of IT software development services. Which of the following actions is most appropriate for the internal auditor to take?

An auditor plans to analyze customer satisfaction, including: (1) customer complaints recorded by the customer service department during the last three months; (2) merchandise returned in the last three months; and (3) responses to a survey of customers who made purchases in the last three months. Which of the following statements regarding this audit approach is correct?