T test
T test
The T test (pronounced: /tiː tɛst/) is a statistical hypothesis testing method used to determine whether there is a significant difference between the means of two groups. The term "T test" was coined by William Sealy Gosset, a chemist working for the Guinness brewery in Dublin, Ireland, who wrote under the pen name "Student".
Etymology
The "T" in T test stands for "Student's", a pseudonym used by Gosset. The test is sometimes referred to as the Student's T test.
Types of T tests
There are three main types of T tests:
- Independent samples T test - This is used when comparing the means of two independent groups. For example, comparing the test scores of students who studied with a tutor versus those who did not.
- Paired samples T test - This is used when comparing the means of the same group at two different times. For example, comparing the test scores of students before and after a study session.
- One-sample T test - This is used when comparing the mean of a single group to a known mean. For example, comparing the average test score of a class to the known average of all students.
Related Terms
- P-value - The probability that the results of your test occurred at random. If your p-value is low, the results of your test are statistically significant.
- Null hypothesis - The assumption that there is no significant difference between specified populations, any observed difference being due to sampling or experimental error.
- Alternative hypothesis - The hypothesis that is contrary to the null hypothesis. It is usually taken to be that the observations are the result of a real effect.
- Degrees of freedom - The number of independent values or quantities which can be assigned to a statistical distribution.
See Also
External links
- Medical encyclopedia article on T test
- Wikipedia's article - T test
This WikiMD dictionary article is a stub. You can help make it a full article.
Languages: - East Asian
中文,
日本,
한국어,
South Asian
हिन्दी,
Urdu,
বাংলা,
తెలుగు,
தமிழ்,
ಕನ್ನಡ,
Southeast Asian
Indonesian,
Vietnamese,
Thai,
မြန်မာဘာသာ,
European
español,
Deutsch,
français,
русский,
português do Brasil,
Italian,
polski