What is a reference sample?

A reference sample serves as a benchmark or standard that is used for comparison purposes in sensory analysis and evaluations. It provides a point of reference to help assess the attributes, quality, or characteristics of other samples. By having a reference sample, analysts can better identify and measure differences or similarities with test samples, using it to gauge overall quality, flavor profiles, or other sensory aspects.

While the other options touch on relevant concepts, they do not fully capture the primary purpose of a reference sample. Options discussing quality standards or previous evaluations may imply some context but do not directly emphasize its role in comparison, which is fundamental to its application in sensory testing. The emphasis on comparison highlights the essential function of a reference sample in evaluating sensory attributes accurately.