How To Calculate P Value From T Score By Hand

Calculating the p-value from a t-score is a crucial statistical operation that helps determine the significance of your data. This guide will walk you through the process step-by-step.

1. Enter your T-Score and Degrees of Freedom (df) in the respective fields.
2. Click the “Calculate” button.
3. View your results below the calculator.

The formula to calculate the p-value from a t-score is:

p-value = 2 * (1 - t.cdf(t-score, df))

Where:

• t-score is the value you input.
• df is the degrees of freedom.
• t.cdf() is the cumulative distribution function of the t-distribution.

Comparison of T-Scores and P-Values

T-Score	P-Value
1.96	0.05
2.58	0.01

• Always ensure your data meets the assumptions of the t-distribution before using this calculator.
• Consider using a t-table or software for more precise calculations.

What is the difference between a t-score and a z-score?

The t-score is used when the population standard deviation is unknown, while the z-score is used when it’s known.

Learn more about the t-distribution

Understand p-values in more detail