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AC591 week 5 quiz

# AC591 week 5 quiz - AC591 Week 5 online quiz 1 Question An...

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AC591 Week 5 online quiz 1. Question: An auditor uses an attribute sampling plan to determine whether large expenditures are being properly approved. The auditor is willing to accept a 2% risk of assessing control risk too low, and has a tolerable rate of 5%. A sample of 100 invoices is selected, and only one is found to be lacking appropriate approval. One invoice selected by the auditor cannot be located. Which statement is true ? Your Answer: Since the sample deviation rate is less than the tolerable rate, the auditor should rely on this control. INCORREC T There is not enough information given to determine whether the auditor should rely on this control. CORRECT ANSWER Since the auditor has a tolerable rate of 5%, he or she can be 95% certain that he or she will make a correct decision. The invoice selected by the auditor that cannot be located is ignored in the calculation of the sample deviation rate. Instructor Explanation: Choice "b" is correct. The missing invoice should be counted as a deviation, resulting in a 2% sample deviation rate. However, this information alone is not sufficient to determine whether the control can be relied upon. The auditor would also need to know the upper deviation rate (or the allowance for sampling risk, which would allow the auditor to calculate the upper deviation rate). It is the upper deviation rate that needs to be compared to the tolerable rate in making decisions. Choice "a" is incorrect. It is the upper deviation rate (and not the sample deviation rate) that needs to be compared to the tolerable rate in making decisions. Choice "c" is incorrect. Since the auditor is willing to accept a 2% risk of assessing control risk too low, this implies that there is a 98% chance that he or she will make a correct decision. Choice "d" is incorrect. Sample items selected by the auditor, which cannot be located, are generally considered deviations. Points Received: 0 of 10 Comments: 2. Question: Stratified sampling would best be used in a situation where: Your Answer: There is a lot of variation among items in the population. CORRE CT The population has an abnormally small standard deviation. The population consists of very few items. The population is unusually homogeneous. Instructor Explanation: Choice "a" is correct. When there is a lot of variability within the population, stratification, or separating the population into relatively homogeneous groups, generally results in a reduced sample size and therefore increases efficiency.

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Choice "b" is incorrect. A small standard deviation means there is little variability within the population, making it less likely that stratification would be used. Choice "c" is incorrect. If the population consists of very few items, the auditor will be likely to test each item rather than breaking the population into homogeneous groups.
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