# one-tailed

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## one-tailed

(Statistics) statistics (of a significance test) concerned with the hypothesis that an observed value of a sampling statistic either significantly exceeds or falls significantly below a given value, where the error is relevant only in one direction: for instance, in testing whether scales are fair a customer does not regard overweight goods as a relevant error. Compare two-tailed
References in periodicals archive ?
We planned to be able to detect a statistically significant effect with four control patients for every burn patient, using a one-tailed test.
He has completely rewritten the chapter on regression modeling and added or clarified material on one-tailed and two-tailed tests, choosing the right statistical tests for a particular study, and programming.
In the case of a 2 x 2 table, along with the Likelihood Ratio and Pearson Chi-square tests, there is also the Fisher's Exact Test, which is based upon the hypergeometric probability and is applicable to either one-tailed or two-tailed hypotheses, relative risk, and odd ratios.
Because the study represents a replication of a previously tested intervention, we used one-tailed tests ([?
The value of t-critical will be obtained from the one-tailed test t-table with a critical error equal to 0.
Statistical Analysis--All tests were one-tailed unless otherwise noted.
Because our predictions are directional, one-tailed tests would be appropriate.
A Student's one-tailed t test was used to detect differences in the means of the subjective and histomorphometric values between the bone marrow and control sites.
The analysis is done using formal test of hypothesis for the difference between two means of financial performances of corporations with three different supervisory board characteristics using both directional one-tailed and nondirectional two-tailed tests.
All comparisons are two-tailed tests unless directionally hypothesised, in which case the one-tailed probability is reported.
In three out of cases the p-value for the one-tailed and two-tailed test was 0.

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