Which of the following would most likely be an advantage in using classical variables sampling rather than probability-proportional-to-size (PPS) sampling?

• A. An estimate of the standard deviation of the population's recorded amounts is not required.
• B. The auditor rarely needs the assistance of a computer program to design an efficient sample.
• C. inclusion of zero and negative balances generally does not require special design considerations.
• D. Any amount that is individually significant is automatically identified and selected.

Answer: (C)

In classical variables sampling, you estimate the population total or misstatement by using a sample of monetary values and treating zeros, positives, and negatives just as values to be analyzed. The big practical advantage over probability-proportional-to-size (PPS) sampling is how it handles zero and negative balances. PPS relies on dollar-sized units to drive selection probabilities, so items with zero or negative balances either contribute nothing to the sampling probabilities or require awkward adjustments to include them. That means special design considerations and additional effort to account for these cases.

With classical variables sampling, no such special treatment is needed. Zeros and negatives are naturally included in the analysis, since all observed values contribute to the estimated total or misstatement just like any other value. This makes CVS more convenient when the population contains many zero or negative balances or when those balances are meaningful to the audit.

Note: CVS typically requires an estimate of the population’s standard deviation to determine sample size, so that part isn’t an advantage; PPS often involves its own design complexities that can require software. And large, individually significant amounts are not automatically selected in either method, since sampling remains random.