Currently, less than 0.5% of the population of the United States—or 1.3 million people—are on active duty.
A population is the entire set of people in a group, regardless of whether they are part of a nation or a collection of people who share a certain trait. The group of people from which a statistical sample is taken for a research is referred to as a population in statistics. As a result, a population can be defined as any collection of people who have something in common. Instead of the complete population, a sample may instead refer to a statistically significant fraction of the population. Because of this, a statistical analysis of a sample must provide an estimate of the standard deviation, often known as the standard error, of its findings from the full population. Only a population-wide analysis would be devoid of standard error.
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