How this calculation works
Find the positive and negative cutoffs for a central Student t interval.
THE FORMULA
Find t where the upper-tail area is (1−confidence)/2A worked example
With ten degrees of freedom and 95% confidence, the cutoffs are about ±2.22814.
Good to know
Confidence is expressed as a percentage.
Reference: OpenStax Introductory Statistics (opens in a new tab) ↗
Read the result
Find the positive and negative cutoffs for a central Student t interval.
The primary result is labeled “Positive critical value”. Keep the input definitions in view when comparing this result with another method.
Try a related calculation
Confidence is expressed as a percentage.
For a related exercise, try the statistics calculator.
A few questions, answered
How can I check the default inputs by hand?
With ten degrees of freedom and 95% confidence, the cutoffs are about ±2.22814.
Which rule does this calculator apply?
Find t where the upper-tail area is (1−confidence)/2