Answer
A parameter is a numerical measurement describing some characteristic of a population. A statistic is a numerical measurement describing some characteristic of a sample.
Work Step by Step
For example, a measured population size of 241,472,385 in the United States is a parameter because it is based on the entire population of all adults in the U.S. A sample size of 2320 surveyed adults is a statistic because it is based on a sample, not the entire adult population of the U.S.
