Do not respond if you are not good in accounting nor if you are familiar with IDEA!
You have been asked to test the effectiveness of Ingo Corporation’s control of manually approving all purchases over $25,000. During the year, Ingo Corporation has made 1,000,000 purchases, of which 3,000 were over $25,000. Jian Zhang, CPA, your supervisor, asked you to use a tolerable deviation rate of 4 percent (although she expects the rate to be only approximately 0.25 percent) and a 5 percent risk of assessing control risk too low.
Use the following to determine the planned assessed level of control risk and the assessed level of control risk.
(Planned) Assessed Level of Control Risk
Slightly below the maximum Maximum
Tolerable Deviation Rate
2–7% 6–12% 11–20% Over 20%
a. What is the planned assessed level of control risk (low, moderate, slightly below the maximum, or maximum)?
b. Use IDEA to determine the appropriate sample size and the allowable number of deviations using IDEA’s Beta Risk Control approach (controlling the risk of assessing control risk too low).
c. For this part assume that the sample size was 114 items. Use IDEA to determine replies for the following to determine the assessed level of control risk under each of the assumptions on deviations included in the sample—0, 1, or 8. Again use IDEA’s Beta Risk control approach (controlling the risk of assessing control risk too low).
As part of your audit of the Abba Company accounts payable function, your audit plan includes a test of controls addressing the company policy requiring that all vouchers be properly approved. You estimate the population deviation rate to be 3 percent.
Assume that a sample of 100 has been drawn, audit tests performed, and a sample deviation rate of 4 percent computed. Furthermore, you have selected a 5 percent risk of assessing control risk too low as appropriate.
d. Use IDEA to determine the achieved upper deviation rate when four deviations have been identified. Assume a population of 5,000 items and that you are using IDEA’s Beta Risk control approach (controlling the risk of assessing control risk too low).
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