Final answer:
The sampling method used to estimate a numeric measurement of a population, like a dollar value, is variable sampling. Variable sampling is concerned with the collection of numerical data, which allows for calculating estimations of specific numeric parameters in the population.
Step-by-step explanation:
The appropriate sampling method used to estimate a numeric measurement of a population, such as a dollar value, would be variable sampling. Variable sampling, also known as quantitative sampling, is used when dealing with measurements that have numerical value and can be correspondingly analyzed to provide an estimation of a specific numeric parameter in the population, like an average or a total.
For example, when a study finds that the mean amount spent on produce per visit by customers in a sample is $12.84, this figure represents a statistic, which is a measurable characteristic of a sample. It is differently from a parameter, which refers to a measurable characteristic of an entire population.
In practice, if you are drawing conclusions from a sample to estimate characteristics of a larger population, you would use variable sampling techniques to gather relevant data points that are numerical in nature, such as amounts spent, weights, heights, etc. This method stands in contrast to attribute sampling, which is used for qualitative data that answer yes/no or present/absent type questions.