In using analysis as an attention-directing procedure at the planning stage of the audit, which of the following would the auditor be least likely to use as a criterion for determining whether to investigate an unexpected and unexplained difference?
1. Dollar cut-off value (for change compared to the previous year)
2. Percentage cut-off value (for change compared to the previous year)
3. Statistical decision rule (measured in standard deviations)
4. Decision rule based on the differences in year-to-year trends in relevant ratios
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