# Alpha

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**See:** α, Greek Alphabet, Greek Numerals, Phoenician Alphabet, Aleph (Letter), A, A (Cyrillic), Significance Level.

## References

### 2015

- (Wikipedia, 2015) ⇒ http://en.wikipedia.org/wiki/alpha Retrieved:2015-1-12.
**Alpha**(uppercase Α, lowercase**α**;*Álpha*) is the first letter of the Greek alphabet. In the system of Greek numerals it has a value of 1. It was derived from the Phoenician letter aleph . Letters that arose from alpha include the Latin A and the Cyrillic letter А.In English, the noun "alpha" is used as a synonym for "beginning", or "first" (in a series), reflecting its Greek roots.

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### 2008

- (Upton & Cook, 2008) ⇒ Graham Upton, and Ian Cook. (2008). “A Dictionary of Statistics, 2nd edition revised.” Oxford University Press. ISBN:0199541450
- QUOTE: Alpha [math]\displaystyle{ \alpha }[/math]: The probability, in a hypothesis test, of rejecting the null hypothesis when it is, in fact, true. Usually called the significance level.