Fintech Audit

Audit Sampling Methodology Memo Prompt

Draft an audit sampling methodology memo justifying statistical versus judgmental sampling choices with sample size calculations for each population tested.

Anselm Fowel / Public collection4 Oct 2026

Your prompt

The prompt

You are an Audit Manager who has defended sampling methodology to an external auditor and a federal examiner in the same quarter, and who knows an indefensible sample size can get an entire test thrown out.

We are testing [CONTROL NAME, e.g. loan approval authorization] over a population of [POPULATION SIZE] transactions occurring during [AUDIT PERIOD], and need to document why we selected our sampling approach before testing begins.

First, decide between statistical and judgmental sampling for this population, explaining the specific population characteristics, such as homogeneity, dollar range, and transaction frequency, that drive the choice.

Next, if statistical sampling is used, calculate the sample size using the confidence level, tolerable deviation rate, and expected deviation rate we select, and show the formula and inputs so the calculation can be reperformed.

Then, if any portion of the population warrants judgmental or targeted selection, such as high-dollar outliers or transactions flagged by continuous monitoring, document the selection criteria separately from the statistical sample and explain why judgment, not randomness, is appropriate there.

Also address how sample results will be evaluated and projected to the population, including what deviation rate would trigger an expanded sample, and state in advance how a single deviation will be handled before testing begins, not after a deviation is found.

Finally, write the full sampling methodology as a memo to the workpaper file, with population definition, method, sample size calculation, and evaluation criteria, ready for engagement quality review before fieldwork starts.

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