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.
Principles of Law Enforcement, which is the body of the rules of conduct that the law. enforcement personnel have to abide with while they are discharging their duty, is a guideline. for personnel in all degrees in executing their duty with competency and merit.