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In statistical hypothesis testing, the null distribution is the probability distribution of the test statistic when the null hypothesis is true. [1] For example, in an F-test, the null distribution is an F-distribution. [2]
A random variable X has a Bernoulli distribution if Pr(X = 1) = p and Pr(X = 0) = 1 − p for some p ∈ (0, 1).. De Finetti's theorem states that the probability distribution of any infinite exchangeable sequence of Bernoulli random variables is a "mixture" of the probability distributions of independent and identically distributed sequences of Bernoulli random variables.
A paper in The Economic Journal, titled "Public Good Superstars: a Lab-in-the-Field Study of Wikipedia", [1] presents results from a nine-year (2011–2020) study of the motivations and contributions of English Wikipedia editors.
The most common reasons for laboratory semen analysis in humans are as part of a couple's infertility investigation and after a vasectomy to verify that the procedure was successful. [4] It is also commonly used for testing human donors for sperm donation, and for animals semen analysis is commonly used in stud farming and farm animal breeding.
Continuously variable slope delta modulation (CVSD or CVSDM) is a voice coding method. It is a delta modulation with variable step size (i.e., special case of adaptive delta modulation), first proposed by Greefkes and Riemens in 1970. CVSD encodes at 1 bit per sample, so that audio sampled at 16 kHz is encoded at 16 kbit/s.
Another of Gillbrand's inventions is the Electronically Controlled Variable Compression engine that he built in the late 1990s. Later renamed the Saab Variable Compression engine (SVC), it was presented at the 2000 Geneva Motor Show. General Motors (GM), Saab's owner at the time, did not approve further development of the SVC engine. This ...
Archi / ɑː ˈ tʃ iː / [3] is a Northeast Caucasian language spoken by the Archis in the village of Archib, southern Dagestan, Russia, and the six surrounding smaller villages. ...
De Forest had been granted general patents for a sound-on-film process in 1919, though it was the Case Research Lab's inventions that made de Forest's systems workable. Case Lab first converted an old silent-film projector into a recording device in 1922, using the projector's light to expose a soundtrack onto film.