A t-test can be used to account for the uncertainty in the sample variance when the sample size is small and the data are exactly normal. There is no universal constant at which the sample size is generally considered large enough to justify use of the plug-in test. Typical rules of thumb range from 20 to 50 samples.
Each symbol and color in the National Law Enforcement Explorers seal has special significance. 1  The circular form of the seal represents continuous existence. 2  The dominant blue field represents justice. 3  The inner circle contains a shield surmounted by an eagle.
A law enforcement officer (LEO) is any individual who is sworn in as a police officer, sheriff deputy, state trooper, or a federal agent to enforce the laws of the jurisdiction he or she serves. Most corrections positions, such as prison guard or prison warden, are not considered law enforcement officer positions.