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3 天前 · Central limit theorem. In probability theory, the central limit theorem ( CLT) states that, under appropriate conditions, the distribution of a normalized version of the sample mean converges to a standard normal distribution. This holds even if the original variables themselves are not normally distributed.
6 天前 · In probability theory and statistics, the chi-squared distribution (also chi-square or -distribution) with degrees of freedom is the distribution of a sum of the squares of independent standard normal random variables. The chi-squared distribution is a special case of the gamma distribution and is one of the most widely used probability distributions in inferential statistics, notably in ...
2024年4月10日 · Binomial distribution for = with n and k as in Pascal's triangleThe probability that a ball in a Galton box with 8 layers (n = 8) ends up in the central bin (k = 4) is /. In probability theory and statistics, the binomial distribution with parameters n and p is the discrete probability distribution of the number of successes in a sequence of n independent experiments, each asking a yes–no ...
3 天前 · In statistics, a normal distribution or Gaussian distribution is a type of continuous probability distribution for a real-valued random variable. The general form of its probability density function is. The parameter is the mean or expectation of the distribution (and also its median and mode ), while the parameter is its standard deviation.
22 小時前 · In standard cosmological calculations, "matter" means any constituent of the universe whose energy density scales with the inverse cube of the scale factor, i.e., ρ ∝ a −3. This is in contrast to "radiation", which scales as the inverse fourth power of the scale factor ρ ∝ a −4, and a cosmological constant, which does not change with respect to a (ρ ∝ a 0).
2 天前 · Neon Genesis Evangelion ( Japanese: 新世紀エヴァンゲリオン, Hepburn: Shinseiki Evangerion, lit. 'New Century Evangelion' in Japanese and lit. 'New Beginning Gospel ' in Greek), [7] also known simply as Evangelion or Eva, is a Japanese mecha anime television series produced by Gainax, animated by Tatsunoko, and directed by Hideaki Anno.
3 天前 · Qin Shi Huang (Chinese: 秦 始皇, pronunciation ; February 259 – 12 July 210 BC) was the founder of the Qin dynasty and the first Emperor of China. Rather than maintain the title of "king" (wáng 王) borne by the previous Shang and Zhou rulers, he assumed the invented title of "emperor" (huángdì 皇帝), which would see continuous use by monarchs in China for the next two millennia.
