Which of the following is a responsibility of the internal auditor once a fraud investigation has been concluded?

Which of the following factors would increase the confidence level in a variables sampling plan?
1. A larger sample size.
2. A stratified sample.
3. A larger standard deviation.

An organization has acquired a new line of business. None of the organization's internal auditors have the required expertise to perform an internal audit of the new business line; therefore, the chief audit executive (CAE) has contracted the services of an external audit firm to perform the engagement. The CAE has assigned a member of the internal audit team to assist the external team with the engagement. According to the Standards, which of the following statements is true regarding supervision of the engagement?

A fast-food company is developing a computer simul-ation involving arrival time at a drive-through restaurant.
The distribution for arrival times is:
Time
Single-Digit Random
Between Arrivals
Probability
Number Assigned
1 minute
0.1
0
2 minutes
0.2
1, 2
3 minutes
0.3
3, 4, 5
4 minutes
0.4
6, 7, 8, 9
Six random numbers are selected to represent the arrival of six cars: 1, 6, 9, 0, 5, 6. The mean time between arrivals for these cars, in this run of the simul-ation model, is:

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?