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What it’s for: Tests of Controls (evaluating whether a control is operating effectively, measured in percentages/yes-no rates).
Sample Deviation Rate
Sample Deviation Rate = Number of Deviations ÷ Sample Size
Computed Upper Deviation Rate (CUDR)
CUDR = Sample Deviation Rate + Allowance for Sampling Risk (obtained from statistical tables)
Allowance for Sampling Risk
Allowance for Sampling Risk = Computed Upper Deviation Rate (CUDR) − Sample Deviation Rate
Control can be relied upon if…
CUDR ≤ Tolerable Deviation Rate
Control cannot be relied upon…
CUDR > Tolerable Deviation Rate
Factor: Confidence ↑
Sample Size ↑
Factor: Expected Deviation ↑
Sample Size ↑
Factor: Tolerable Deviation ↑
Sample Size ↓