In statistical significance testing, a one-tailed test and a two-tailed test are alternative ways of computing the statistical significance of a parameter...

two-tailed p-values can be calculated as Φ(Z) (for lower/left-tailed tests), Φ(−Z) (for upper/right-tailed tests) and 2Φ(−|Z|) (for two-tailed tests), where...

Omnibus test One- and two-tailed tests One-class classification One-factor-at-a-time method One-tailed test – redirects to One- and two-tailed tests One-way...

the one-tailed test above. In order to consider both the biases, we use a two-tailed test. Note that to do this we cannot simply double the one-tailed p-value...

Directed tests combine the attributes of one-tailed and two-tailed tests. "...directed tests should be used in virtually all applications where one-sided...

the revised test statistic T−50. Using one of these sampling distributions, it is possible to compute either a one-tailed or two-tailed p-value for the...

location test of the null hypothesis such that the means of two populations are equal. All such tests are usually called Student's t-tests, though strictly...

critical values for any given percentage point depend on: whether a one- or- two-tailed test is performed; the number of groups being compared; the overall...

a pooled t-test or the Welch's t-test for two sample tests or analysis of variance or Welch's modified oneway ANOVA for multi-level tests. However, it...

t-distribution to test one of two possible null hypotheses: A two-tailed test, in which the two population means are equal; or A one-tailed test, in which one of the...

| > 1.96 {\displaystyle |z|>1.96} (for a two-tailed test). Or, alternatively, by computing the p-value and rejecting the null hypothesis if p < α {\displaystyle...

unmistakable wedge-shaped tail, an elongated upper mandible, a strong beak and powerful feet. The wedge-tailed eagle is one of 12 species of large, predominantly...

between hind leg length and foreleg length. This is a two-tailed test, rather than a one-tailed test. For the two tailed test, the alternative hypothesis...

the results of the tail flick test and it is important to consider this effect when performing the test. Lastly, many thermal tests do not distinguish...

The tail suspension test (TST) is an experimental method used in scientific research to measure stress in rodents. It is based on the observation that...

with values of the chi-squared distribution with one degree of freedom. This gives a two-tailed test. The approximation is reliable for more than 20 subjects...

better. A two-tailed test may still be used but it will be less powerful than a one-tailed test, because the rejection region for a one-tailed test is concentrated...

called a one-tailed test. However, one might be interested in deviations in either direction, favoring either heads or tails. The two-tailed p-value,...

if the population distributions are normal or are light-tailed and symmetric, then ANOVA F-test will generally have greater power which is the probability...

"KSgeneral: KSgeneral: Computing P-Values of the One-Sample K-S Test and the Two-Sample K-S and Kuiper Tests for (Dis)Continuous Null Distribution". CRAN...

essentially a V tail that extended both above and below the fuselage. The most popular conventionally V-tailed aircraft that has been mass-produced is the...

for one-sided right-tailed p-values; minor modifications can be made if two-sided or left-tailed p-values are being analysed. Specifically, if two-sided...

calculate the values of p for both these tables, and add them together. This gives a one-tailed test, with p approximately 0.001346076 + 0.000033652 =...

various one-tailed and two-tailed versions of the test in the wilcoxon_test function. SciPy includes an implementation of the Wilcoxon signed-rank test in...

December 2008 and August 2009, was undertaken to validate the design and gradually expand the aircraft operating envelope. The flight tests were complete...

and short-tailed) were originally exhibited as two varieties of the one Cattle Dog breed, but by the 1950s, separate classes – Cattle Dog (long-tail)...

p-value computed from the test statistic. Roughly 100 specialized statistical tests are in use and noteworthy. While hypothesis testing was popularized early...

Permutation, Parametric, and Bootstrap Tests of Hypotheses (3rd ed.). New York: Springer. Derrick, B; Ruck, A; Toher, D; White, P (2018). "Tests for equality of...

related. The rufous-tailed hawk, while comparatively little studied, is very similar to the red-tailed hawk, being about the same size and possessing the same...

with the region of rejection for only one tail of the sampling distribution. Two-tailed directional. A two-tailed directional alternative hypothesis is...