ACL Assignments – Audit

ACL Assignments – Audit

ACL Assignments – Audit

Problem 1

Use ACL to determine the sample size an auditor should use for attributes sampling given the criteria listed below:

With any ACL project (e.g., Roger Company) open, choose Sampling on the menu toolbar
Click on Calculate Sample Size
Choose the Record option
Confidence is 95
Population is 1000
Upper Error Limit (%) is 8 (this is tolerable error)
Expected Error Rate (%) is 3
Click Calculate
What is the recommended sample size?

Problem 2

How would the sample size change if all sample-size inputs listed in Problem 1 stayed the same with the exceptions listed below? Please evaluate each item independently by resetting the inputs to those listed in Problem 1 and changing only the one factor listed in each item below. (Hint: If you use the Calculate button rather than the OK button the sample size window will stay open).

Confidence dropped to 90 percent?
Population increased to 500,000?
Expected Error Rate (%) increased to 4?
Upper Error Limit (%) decreases to 7?
Upper Error Limit (%) increases to 15?

Problem 3

Using your results from Problem 2 above:

Which of the following four input factors—confidence, population, upper error limit, or expected error rate—has the smallest effect on the sample size?
Which two factors appear to have the greatest effect on sample size?
Go into ACL’s sampling size tool and input the factors listed in Problem 1 and then experiment with increasingly larger expected error rates. What happens as the expected error rate is nearly as large as the upper error limit or tolerable error? Why does this happen?
Problem 4

For the following three control attributes, you want to be 90 percent confident that the population deviation rate does not exceed 7.5 percent.

Attribute 1-The purchase order was approved (purchasing department stamp provides evidence)

Attribute 2-The purchase order, receiving report, and vendor invoice are included in each voucher packet

Attribute 3-The accounts payable department compared product and quantities across the three documents (initials by an accounts payable clerk and auditor reperformance provide evidence)

You tested a sample of 52 voucher packages and discovered the following deviations:

Attribute 1: 2 deviations
Attribute 2: 1 deviation
Attribute 3: 0 deviations
With any ACL project open (e.g., Roger Company) evaluate the results of your testing by:

Select Sampling >> Evaluate Error
Make sure Record is the selected sample type
Enter the applicable parameters (e.g., Confidence is 90 and Sample Size is 52, Number of Errors or deviations listed above)
Click OK
What is the upper error limit frequency for each attribute?

Based on the results of your controls testing, which controls are considered effective? Please explain why or why not?