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T-value, t
| Глоссарий по стандартизации, контролю и управлению качеством |
A statistic from the t-test. it is a ratio of a systematic error component divided by a random error component [bias/(sdiff/n1/2)].
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Systematic, английский
Common to all businesses.
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Waived tests, английский
A specific category of tests defined by clia, such as dipstick tests, fecal occult blood, urine pregnancy tests, erythrocyte sedimentation rates, blood glucose monitoring devices, etc., which are subject to the lowest level of regulation. the main requirement for qc is to follow the manufacturer`s directions.
T-test, английский
Often called student’s t-test. a statistical test of significance in which the difference between two mean values is tested. the null hypothesis is that there is no difference between the two means. the test is carried out by calculating a t-value, then comparing the calculated t-value with a critical t-value which is obtained from a statistics table. if the calculated t-value is greater than the critical t-value, the null hypothesis is rejected; this means that a statistically significant or real difference exists between the mean values being compared. if the calculated t-value is less than the critical t-value, the null hypothesis stands, therefore no difference has been observed between the two mean values.
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