What is df in t-test?
Understand the Problem
The question is asking for the meaning of 'df' in the context of a t-test, which typically refers to 'degrees of freedom' in statistical analysis.
Answer
Degrees of freedom in a t-test.
Degrees of freedom (df) in a t-test refer to the number of independent values or quantities which can be assigned to a statistical distribution.
Answer for screen readers
Degrees of freedom (df) in a t-test refer to the number of independent values or quantities which can be assigned to a statistical distribution.
More Information
In the context of the t-test, degrees of freedom are used to determine the critical value from the t-distribution. For a simple t-test comparing two sample means, df is typically calculated as the total number of data points in both groups minus 2.
Tips
A common mistake is to confuse the degrees of freedom for different types of t-tests (e.g., paired vs. unpaired) and not adjusting it based on the samples being tested.
Sources
- T-Distribution | What It Is and How To Use It (With Examples) - statisticshowto.com
- Degrees of Freedom in Statistics and Mathematics - thoughtco.com
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