different between probie vs probit

English

probationary +? -ie

probie (plural probies)

(slang) Someone holding a position on a probationary basis, subject to performance or examination.
(slang, firefighting) A neophyte firefighter.
- 1997. Steve Delson. "The Fire Inside: Firefighters Talk About Their Lives", Page 41
  A probie never complains. A probie keeps his mouth shut, his eyes open. A probie is never idle. A probie is always learning or drilling or cleaning. That's why you're still called a probie: for one year after you leave training school.

Blend of probability +? unit. Coined by Chester Ittner Bliss in 1934.

probit (plural probits)

(statistics) A unit, derived from a standard distribution, used in measuring the responses to doses

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