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  2. One- and two-tailed tests - Wikipedia

    en.wikipedia.org/wiki/One-_and_two-tailed_tests

    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 ...

  3. Statistical hypothesis test - Wikipedia

    en.wikipedia.org/wiki/Statistical_hypothesis_test

    Suppose the data can be realized from an N(0,1) distribution. For example, with a chosen significance level α = 0.05, from the Z-table, a one-tailed critical value of approximately 1.645 can be obtained. The one-tailed critical value C α ≈ 1.645 corresponds to the chosen significance level.

  4. Test statistic - Wikipedia

    en.wikipedia.org/wiki/Test_statistic

    The above image shows a table with some of the most common test statistics and their corresponding statistical tests or models.. Test statistic is a quantity derived from the sample for statistical hypothesis testing. [1]

  5. p-value - Wikipedia

    en.wikipedia.org/wiki/P-value

    The two-tailed p-value, which considers deviations favoring either heads or tails, may instead be calculated. As the binomial distribution is symmetrical for a fair coin, the two-sided p-value is simply twice the above calculated single-sided p-value: the two-sided p-value is 0.115. In the above example:

  6. Student's t-distribution - Wikipedia

    en.wikipedia.org/wiki/Student's_t-distribution

    The following table lists values for t distributions with ν degrees of freedom for a range of one-sided or two-sided critical regions. The first column is ν , the percentages along the top are confidence levels α , {\displaystyle \ \alpha \ ,} and the numbers in the body of the table are the t α , n − 1 {\displaystyle t_{\alpha ,n-1 ...

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  8. Archaeologists Found 123 Ancient Bodies in a Garden—Now, They ...

    www.aol.com/lifestyle/archaeologists-found-123...

    Archaeologists discovered 123 bodies from the 12 th century dumped in a vertical shaft near Leicester Cathedral.. The remains include men, women, and children, and show no signs of violence. The ...

  9. Talk:One- and two-tailed tests - Wikipedia

    en.wikipedia.org/wiki/Talk:One-_and_two-tailed_tests

    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 ...