The level of precision needed of any sample depends on the topic of the line of enquiry. But if not, a small sample may be sufficient. If detailed results are required for appropriate observations and recommendations, then sufficiently large samples must be planned to accommodate reporting of subsets of sample data. Auditors should realize that starting with a minimal sample size does not allow for any drilling down of results. Weighted proportions can be used when calculating overall findings.Īny reported finding needs to have a large enough sample that meets the auditor’s requirement for precision and reliability of results. In situations where a very large overall sample is required, efficiencies can be gained through stratification (i.e., a sample per subpopulation) and planning the minimum sample required for each reported finding. Obviously, a high level of detail requires increasing the total sample size. Level of detail is the degree to which auditors wish to drill down into data and report on segments of the sample as well as overall results. Several factors influence the sample size required for an audit: Appendix 1 – Sample Size Determination for Generalizable Sampling Sample Size
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