Audit Sampling for Tests of Controls and Substantive Tests of Transactions
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1 Audit Sampling for Tests of Controls and Substantive Tests of Transactions Chapter Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-1
2 Learning Objective 1 Explain the concept of representative sampling Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-2
3 Representative Samples A representative sample is one in which the characteristics in the sample of audit interest are approximately the same as those of the population. Nonsampling risk is the risk that audit tests do not uncover existing exceptions in the sample Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-3
4 Representative Samples Sampling risk is the risk that an auditor reaches an incorrect conclusion because the sample is not representative of the population. Sampling risk is an inherent part of sampling that results from testing less than the entire population Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-4
5 Sampling Risk 1. Adjust sample size 2. Use an appropriate method of selecting sample items from the population 2008 Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-5
6 Learning Objective 2 Distinguish between statistical and nonstatistical sampling and between probabilistic and nonprobabilistic sample selection Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-6
7 Statistical Versus Nonstatistical Sampling Similarities: Step 1: Plan the sample Step 2: Select the sample and perform the tests Step 3: Evaluate the results 2008 Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-7
8 Statistical Versus Nonstatistical Sampling Differences: Statistical sampling allows the quantification of sampling risk in planning the sample (Step 1) and evaluating the results (Step 3) In nonstatistical sampling those items that the auditor believes will provide the most useful information are selected 2008 Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-8
9 Probabilistic Versus Nonprobabilistic Sample Selection Probabilistic sample selection is a method of selecting a sample such that each population item has a known probability of being included in the sample. Nonprobabilistic sample selection is a method in which the auditor uses professional judgment rather than probabilistic methods Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-9
10 Probabilistic Versus Nonprobabilistic Sample Selection Nonprobabilistic: 1. Directed sample selection 2. Block sample selection 3. Haphazard sample selection 2008 Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-10
11 Probabilistic: Probabilistic Versus Nonprobabilistic Sample Selection 1. Simple random sample selection 2. Systematic sample selection 3. Probability proportional to size sample selection 4. Stratified sample selection 2008 Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-11
12 Nonprobabilistic Sample Selection Methods Directed sample selection is the selection of each item based on auditor judgmental criteria. Items most likely to contain misstatements Items containing selected population characteristics Large dollar coverage 2008 Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-12
13 Nonprobabilistic Sample Selection Methods Block sample selection is the selection of several items in sequence. Haphazard sample selection is the selection of items without any conscious bias on the part of the auditor Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-13
14 Learning Objective 3 Select representative samples Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-14
15 Probabilistic Sample Selection Methods A simple random sample is one in which every possible combination of elements in the population has an equal chance of constituting the sample. Random number tables Computer generation of random numbers 2008 Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-15
16 Probabilistic Sample Selection Methods Systematic sample selection: The auditor calculates an interval and then selects the items for the sample based on the size of the interval. The interval is determined by dividing the population size by the number of sample items desired Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-16
17 Probabilistic Sample Selection Methods Probability proportional to size: A sample is taken where the probability of selecting any individual population item is proportional to its recorded amount (PPS) Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-17
18 Probabilistic Sample Selection Methods Stratified sample selection: The population is divided into subpopulations by size and larger samples are taken of the larger subpopulations Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-18
19 Learning Objective 4 Define and describe audit sampling for exception rates Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-19
20 Sampling for Exception Rates The occurrence rate, or exception rate, is the ratio of the items containing the specific attribute to the total number of population items Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-20
21 Sampling for Exception Rates Following are types of exceptions in populations of accounting data: 1. Deviations from client s established controls 2. Monetary misstatements in populations of transaction data 3. Monetary misstatements in populations of account balance details 2008 Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-21
22 Learning Objective 5 Use nonstatistical sampling in tests of controls and substantive tests of transactions Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-22
23 Terms Used in Audit Sampling Terms related to planning: Characteristic or attribute Acceptable risk of assessing control risk too low (ARACR) Tolerable exception rate (TER) Estimated population exception rate (EPER) Initial sample size 2008 Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-23
24 Terms Used in Audit Sampling Terms related to evaluating results: Exception Sample exception rate (SER) Computed upper exception rate (CUER) 2008 Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-24
25 I: Plan the Sample Step 1: State the objectives of the audit test. Step 2: Decide whether audit sampling applies. Step 3: Define attributes and exception conditions. Step 4: Define the population. Step 5: Define the sampling unit Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-25
26 I: Plan the Sample Step 6: Specify the tolerable exception rate. Step 7: Specify acceptable risk of assessing control risk too low. Step 8: Estimate the population exception rate. Step 9: Determine the initial sample size Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-26
27 II: Select the Sample and Perform the Audit Procedures Step 10: Select the sample. Step 11: Perform the audit procedures Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-27
28 III: Evaluate the Results Step 12: Generalize from the sample to the population. Step 13: Analyze exceptions. Step 14: Decide the acceptability of the population Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-28
29 Factor Guidelines for ARACR and TER Tests of Control Assessed control risk. Consider: Need to issue a separate report on internal control over financial reporting for public companies Nature, extent, and timing of substantive tests Quality of evidence available for tests of controls Judgment Lowest assessed control risk Moderate assessed control risk Higher assessed control risk 100% assessed control risk Guideline ARACR of low ARACR of medium ARACR of high ARACR not applicable 2008 Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-29
30 Factor Guidelines for ARACR and TER Tests of Control Significance of the transactions and related account balances that the internal controls are intended to affect Judgment Highly significant balances Significant balances Less significant balances Guideline TER of 4% TER of 5% TER of 6% 2008 Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-30
31 Guidelines for ARACR and TER Tests of Transactions Planned reduction in substantive tests of details of balances Large Moderate Small Results of understanding internal control and tests of controls Excellent Good Not good Excellent Good Not good Excellent Good Not good 2008 Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-31
32 Guidelines for ARACR and TER Tests of Transactions Planned reduction in substantive tests of details of balances Large Moderate Small ARACR for substantive tests of transactions High Medium Low High Medium Medium-low High Medium-high Medium TER for substantive tests of transactions Percent or amount based on materiality considerations Percent or amount based on materiality considerations Percent or amount based on materiality considerations 2008 Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-32
33 Effect on Sample Size of Changing Factors Type of change Increase acceptable risk of assessing control risk too low Increase tolerable risk rate Increase estimated population exception rate Increase population size Effect on initial sample size Decrease Decrease Increase Increase (minor) 2008 Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-33
34 Decide the Acceptability of the Population Revise TER or ARACR Expand the sample size Revise assessed control risk Communicate with the audit committee or management 2008 Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-34
35 From Step 12 Compare Summary of Audit Sampling Steps To/From Step 6 Plan the sample (Steps 1-9) Computed upper exception rate Select the sample (Step 10) Perform the tests (Step 11) Number of exceptions in sample and actual sample size To Step 14 Evaluate the results (Steps 12-14) To Step Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-35
36 Learning Objective 6 Define and describe attributes sampling and a sampling distribution Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-36
37 Statistical Audit Sampling The statistical sampling method most commonly used for tests of controls and substantive tests of transactions is attributes sampling Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-37
38 Sampling Distribution It is a frequency distribution of the results of all possible samples of a specified size that could be obtained from a population containing some specific parameters. Attributes sampling is based on the binomial distribution Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-38
39 Learning Objective 7 Use attributes sampling in tests of controls and substantive tests of transactions Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-39
40 Application of Attributes Sampling Use of the tables: i. Select the table corresponding to the ARACR ii. Locate the TER on the top of the table iii. Locate the EPER in the far left column iv. Read down the appropriate TER column until it intersects with the appropriate EPER row in order to get the initial sample size 2008 Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-40
41 Application of Attributes Sampling Effect of population size: Population size is a minor consideration in determining sample size Representativeness is ensured by the sample selection process more than by sample size 2008 Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-41
42 Application of Attributes Sampling Select the sample Perform the audit procedures Evaluate the results 2008 Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-42
43 End of Chapter Prentice Hall Business Publishing, Auditing 12/e, Arens/Beasley/Elder 15-43
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