Terms & Properties |

**Concept Unique Identifier (CUI): **C0871472

**NCI Thesaurus Code: **C53231
(see NCI Thesaurus info)

**Semantic Type: **Quantitative Concept

**NCIt Definition: **A statistical hypothesis test based on a test statistic whose sampling distribution is a t-distribution. The term "t-test" is often used in a narrower sense: it refers to a popular test aimed at testing the hypothesis that the population mean is equal to some value m (see also t-statistic). The most popular t-tests are aimed at testing the following hypotheses: 1. The population mean is as hypothesized (the population variance is not known); 2. The means of two populations are equal (the population variances are not known but equal); 3. The means of two populations are equal (the population variances are not known and not equal); 4. The correlation coefficient for two random variables is zero; 5. The slope of the population regression line is zero.

**NCI-GLOSS Definition: **A statistical test that is used to find out if there is a real difference between the means (averages) of two different groups. It is sometimes used to see if there is a significant difference in response to treatment between groups in a clinical trial.

**CDISC-GLOSS Definition: **A statistical test used to compare the means of two groups of test data.

**Synonyms & Abbreviations:**
(see Synonym Details)

t test |

t-test |

**External Source Codes: **

NCI Thesaurus Code | C53231 (see NCI Thesaurus info) |

Name | Value | Source |
---|---|---|

Contributing_Source | CDISC-GLOSS | NCI |

**Additional Concept Data: ** *(none)*

**URL to Bookmark**:
https://ncim-stage.nci.nih.gov/ncimbrowser/ConceptReport.jsp?dictionary=NCI Metathesaurus&code=C0871472