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 is a government employee who is responsible for the prevention, investigation, apprehension, or detention of individuals suspected or convicted of offenses against the criminal laws, including an employee engaged in this activity who is transferred to a supervisory or administrative position; or serving as a probation or ...