Exam 15: Audit Sampling for Tests of Controls and Substantive Tests of Transactions

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The sum of the tolerable exception rate and the estimated population exception rate is the precision of the initial sample estimate.

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Describe each of the four types of sample selection methods commonly associated with statistical audit sampling.

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Four types of sample selection methods commonly associated with statistical audit sampling are:
• Simple random sample selection. Every possible combination of elements in the population has an equal chance of being included in the sample.
• Systematic sample selection. A probabilistic method of sampling in which the auditor calculates an interval (the population size divided by the number of sample items desired) and selects the items for the sample based on the size of the interval and a randomly selected number between zero and the interval size.
• Probability proportional to size sample selection. The probability of selecting any individual population item is proportional to its recorded amount.
• Stratified sample selection. A probabilistic method of sampling in which the population is divided into subpopulations, and samples are taken from each of the subpopulations.

The sample exception rate equals

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Discuss what is meant by "sampling risk" and "nonsampling risk."

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In using audit sampling for exception rates

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One of the causes of nonsampling risk is

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Which of the following statements is correct when dealing with sampling for exception rates?

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Which of the following is not a term related to evaluating results in audit sampling until after a sample is tested and evaluated?

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Which of the following would have the least impact in determining sample size?

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A sample of all items in a population will have a zero sampling risk.

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It is equally acceptable under professional auditing standards for auditors to use either statistical or nonstatistical sampling methods.

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The process which requires the calculation of an interval and then selects the items based on the size of the interval is

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Which of the following is a correct statement regarding block sampling?

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When planning the sample,

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It is never possible to know whether a sample is truly representative of a population.

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List the two ways auditors can control sampling risk.

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Audit sampling can be applied to manual controls when application of the control produces documentary evidence of performance.

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Assume the auditor decides a control is not effective if there is a population exception rate of 3%. Assume the auditor accepts this control as effective based on test of control with a sample of 100 items that had 2 exceptions. If the population actually has a 6% exception rate, the auditor correctly accepted the population because the sample was representative of the population.

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Which of the following is the risk that audit tests will not uncover existing exceptions in a sample?

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In systematic sample selection, the population size is divided by the number of sample items desired in order to determine the

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