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Qu'est-ce (qui) est fair coin - définition
Fair coin
.jpg?width=200 "A fair coin, when tossed, should have an equal chance of landing either side up.")
STATISTICAL CONCEPT
Unfair coin; Biased coin; Ideal coin
In probability theory and statistics, a sequence of independent Bernoulli trials with probability 1/2 of success on each trial is metaphorically called a fair coin. One for which the probability is not 1/2 is called a biased or unfair coin.
Checking whether a coin is fair
COMMON EXAMPLE PROBLEM IN STATISTICS
Checking if a coin is biased; Estimator of true probability; Checking whether a coin be fair; Checking if a coin be fair; Checking if a coin is fair
In statistics, the question of checking whether a coin is fair is one whose importance lies, firstly, in providing a simple problem on which to illustrate basic ideas of statistical inference and, secondly, in providing a simple problem that can be used to compare various competing methods of statistical inference, including decision theory. The practical problem of checking whether a coin is fair might be considered as easily solved by performing a sufficiently large number of trials, but statistics and probability theory can provide guidance on two types of question; specifically those of how many trials to undertake and of the accuracy an estimate of the probability of turning up heads, derived from a given sample of trials.
Coin flipping
![tossing for innings]].](https://commons.wikimedia.org/wiki/Special:FilePath/BradmanAllenToss.jpg?width=200 "tossing for innings]].")
![The coin toss at the start of [[Super Bowl XLIII]]](https://commons.wikimedia.org/wiki/Special:FilePath/Coin toss at Super Bowl 43 1.jpg?width=200 "The coin toss at the start of [[Super Bowl XLIII]]")
![Pompey the Great]] on the obverse and a ship on the reverse](https://commons.wikimedia.org/wiki/Special:FilePath/Pompey by Nasidius.jpg?width=200 "Pompey the Great]] on the obverse and a ship on the reverse")
PRACTICE OF THROWING A COIN IN THE AIR TO CHOOSE BETWEEN TWO ALTERNATIVES
Heads or Tails; Head and Tail; Cross and Pile; Coin-tossing problem; Coin tossing; Coin toss; Coin flip; Coin-tossing; Coin throw; Tossing a coin; Indian or Wheat; Heads or tails; Flipping a coin; Cross and pile; Coin flips; Heads or Tails?; Coin-flip; Flip a coin; Coin-flipping; Coin Toss; Coin-toss; Toss of a coin; Cointoss
Coin flipping, coin tossing, or heads or tails is the practice of throwing a coin in the air and checking which side is showing when it lands, in order to choose between two alternatives, heads or tails, sometimes used to resolve a dispute between two parties. It is a form of sortition which inherently has two possible outcomes.
