Final answer:
A paired data set pairs one set of information with another, ensuring a one-to-one relationship between data points and equal set sizes, allowing any two pairs to be used in calculations.
Step-by-step explanation:
Paired data pairs one set of information with another set of information. It consists of two data sets that have a one-to-one relationship, so each data point in one set is matched with exactly one point from the other set. For example, if you have two sets of test scores, one set from before a study and another set from after the study, you can create a paired data set by matching the scores of each student before and after the study.