Final answer:
The estimation of unapproved cash disbursements is likely performed using convenience sampling, a non-probabilistic approach that selects items due to their easy accessibility.
Step-by-step explanation:
Estimating the percentage of cash disbursements processed during the year that were not approved is likely to be done using convenience sampling.
In the field of auditing and accounting, when a precise, statistically-valid sample is not required or when resources are limited, convenience sampling can be used. This method involves selecting items because they are easier to access and not necessarily because they represent the entire population. For instance, an auditor may choose transactions that are readily available or occur more frequently. This approach is time-saving and cost-effective, but it lacks scientific rigor. It is imperative for an auditor to understand that the results derived from convenience sampling cannot be generalized to the entire population due to the non-probabilistic nature of the sample selection.
In contrast, cluster sampling is another nontraditional method, which although cheaper than probability sampling, offers less representativeness. In this method, the population is divided into clusters like shared cities or schools, and then a random selection within these clusters is made. However, for the purpose of the student's question, convenience sampling is the appropriate term.