T test
T-test is a type of inferential statistics used to determine if there is a significant difference between the means of two groups. The T-test is based on the Student's t-distribution, which is a probability distribution that is used to estimate population parameters when the sample size is small and/or when the population variance is unknown.
History[edit | edit source]
The T-test was developed by William Sealy Gosset, a chemist working for the Guinness brewery in Dublin, Ireland. Gosset published the T-test in the journal Biometrika in 1908 under the pseudonym "Student".
Types of T-tests[edit | edit source]
There are three main types of T-tests: independent samples T-test, paired sample T-test, and one-sample T-test.
Independent samples T-test[edit | edit source]
The independent samples T-test is used when two separate sets of independent and identically distributed samples are obtained, one from each of the two populations being compared.
Paired sample T-test[edit | edit source]
The paired sample T-test is used when the samples are dependent; that is, when there is only one sample that has been tested twice (repeated measures) or when there are two samples that have been matched or paired.
One-sample T-test[edit | edit source]
The one-sample T-test is used when we want to know whether our sample comes from a particular population but we do not have a second sample to compare it with.
Assumptions[edit | edit source]
The T-test assumes that the data are normally distributed and that the variances of the two populations are equal (homogeneity of variance). If these assumptions are not met, a different test, such as the Mann-Whitney U test, may be more appropriate.
See also[edit | edit source]
References[edit | edit source]
| T test Resources | |
|---|---|
 |
 |
Search WikiMD
Ad.Tired of being Overweight? Try W8MD's physician weight loss program.
Semaglutide (Ozempic / Wegovy and Tirzepatide (Mounjaro / Zepbound) available.
Advertise on WikiMD
|
WikiMD's Wellness Encyclopedia |
| Let Food Be Thy Medicine Medicine Thy Food - Hippocrates |
Translate this page: - East Asian
中文,
日本,
한국어,
South Asian
हिन्दी,
தமிழ்,
తెలుగు,
Urdu,
ಕನ್ನಡ,
Southeast Asian
Indonesian,
Vietnamese,
Thai,
မြန်မာဘာသာ,
বাংলা
European
español,
Deutsch,
français,
Greek,
português do Brasil,
polski,
română,
русский,
Nederlands,
norsk,
svenska,
suomi,
Italian
Middle Eastern & African
عربى,
Turkish,
Persian,
Hebrew,
Afrikaans,
isiZulu,
Kiswahili,
Other
Bulgarian,
Hungarian,
Czech,
Swedish,
മലയാളം,
मराठी,
ਪੰਜਾਬੀ,
ગુજરાતી,
Portuguese,
Ukrainian
Medical Disclaimer: WikiMD is not a substitute for professional medical advice. The information on WikiMD is provided as an information resource only, may be incorrect, outdated or misleading, and is not to be used or relied on for any diagnostic or treatment purposes. Please consult your health care provider before making any healthcare decisions or for guidance about a specific medical condition. WikiMD expressly disclaims responsibility, and shall have no liability, for any damages, loss, injury, or liability whatsoever suffered as a result of your reliance on the information contained in this site. By visiting this site you agree to the foregoing terms and conditions, which may from time to time be changed or supplemented by WikiMD. If you do not agree to the foregoing terms and conditions, you should not enter or use this site. See full disclaimer.
Credits:Most images are courtesy of Wikimedia commons, and templates, categories Wikipedia, licensed under CC BY SA or similar.
Contributors: Prab R. Tumpati, MD
