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A two-tailed test applied to the normal distribution. A one-tailed test, showing the p-value as the size of one tail. In statistical significance testing, a one-tailed test and a two-tailed test are alternative ways of computing the statistical significance of a parameter inferred from a data set, in terms of a test statistic. A two-tailed test ...
For example, you would use a two-tailed test if one random sample was 15 quarter horses and the second sample was 15 sires or dams of those same horses. A one-tailed test is appropriate if no known relationship exists between the samples, for example, two random samples of 15 unrelated quarter horses. -- 206.208.110.32 20:58, 17 August 2005 ...
Specific examples are given in the following subsections. [60] contains a review and table of log-normal distributions from geology, biology, medicine, food, ecology, and other areas. [61] is a review article on log-normal distributions in neuroscience, with annotated bibliography.
The one-tailed nature of the test resulted from the one-tailed alternate hypothesis (a term not used by Fisher). The null hypothesis became implicitly one-tailed. The logical negation of the Lady's one-tailed claim was also one-tailed. (Claim: Ability > 0; Stated null: Ability = 0; Implicit null: Ability ≤ 0).
In probability theory, the tail dependence of a pair of random variables is a measure of their comovements in the tails of the distributions. The concept is used in extreme value theory . Random variables that appear to exhibit no correlation can show tail dependence in extreme deviations.
Similarly, this hypothesis is supported by the fact that the annual grasses have been evolved (adapted) to the dry climate of monsoonal Asia. [27] Furthermore, the climatic stresses also interfere with the ecology, morphology, and physiology of plants for example the drought can affect the flowering time and pattern in plant species. Flowering ...
The tail is also more exposed and active than the backbone, so there's a greater chance of injury. Number 1: The term 'hair of the dog' comes from the tail. Back in the day, Pliny the Elder said ...
The most extreme case of a fat tail is given by a distribution whose tail decays like a power law. A variety of Cauchy distributions for various location and scale parameters. Cauchy distributions are examples of fat-tailed distributions. That is, if the complementary cumulative distribution of a random variable X can be expressed as [citation ...