What is a T-table used for?

A T-table (also called Student's t-distribution table) is used to find critical values for statistical hypothesis testing when the sample size is small and the population standard deviation is unknown. It's essential for determining whether to reject or accept a null hypothesis in t-tests.

How do you read a T-table?

To read a T-table: 1) Find your degrees of freedom (sample size - 1) in the left column, 2) Choose your confidence level or significance level in the top row, 3) The intersection shows the critical t-value for your test. For two-tailed tests, use the appropriate column based on your alpha level divided by 2.

What are degrees of freedom in a T-table?

Degrees of freedom (df) in a T-table equals the sample size minus 1 (n-1). It represents the number of independent values that can vary in your analysis. Higher degrees of freedom result in a t-distribution that more closely resembles the normal distribution.

T Table

Find in this t table (same as t distribution table, t score table, Student’s t table) t critical value by confidence level & DF for the Student’s t distribution.

Student's T distribution table showing critical t-values for confidence levels from 80% to 99.9% and degrees of freedom from 1 to 1000

>>>Click to use a T-value calculator<<<

Or use the student's t score calculator below:

Student t-Value Calculator

In order to calculate the Student T Value for any degrees of freedom and given probability. The calculator will return Student T Values for one tail (right) and two tailed probabilities. Please input degrees of freedom and probability level and then click “CALCULATE”

Degrees of freedom:

Significance level:

T-VALUE [two-tail]

+/-

T-VALUE [one-tailed]

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