Which of the following statements is correct concerning the auditor’s use of statistical sampling?
- An auditor needs to estimate the dollar amount of the standard deviation of the population to use classical variables sampling.
- An assumption of PPS sampling is that the underlying accounting population is normally distributed.
- A classical variables sample needs to be designed with special considerations to include negative balances in the sample.
- The selection of zero balances usually does not require special sample design considerations when using PPS sampling.