Final answer:
Classical variables sampling is used to estimate numerical measurements of a population, which is appropriate for estimating the dollar value of an account. Random-number sampling would be used to estimate a numerical measurement of the population, such as the dollar value of an account. So the correct answer is option 3.
Step-by-step explanation:
To estimate a numerical measurement of population, such as the dollar value of an account, the appropriate sampling method would be Classical variables sampling. This method is used to estimate specific numerical characteristics, like averages or totals, from a population.
Attributes sampling, on the other hand, is used for making estimates about proportions or counts of certain qualities within a population. Stop-or-go sampling is a cost-saving statistical method that allows an early decision on whether to continue with the sampling process.
Random-number sampling is not a distinct method but rather a procedure that is often part of implementing random sampling approaches, like simple random sampling, to ensure every member of a population has an equal chance of being selected.