t-Test Coefficient Generator

The following web tool will determine the t value for calculating confidence intervals. Because it is sometimes necessary to calculate confidence intervals that are not tabulated, this tool was specifically designed to calculate t values for any confidence interval between 50% and 99.95% with 1 to 120 degrees of freedom. For explicit information on how this is done, and for a little more information on Confidence Intervals and how you use them, you may want to visit the math methods page.

In the two boxes below you should place your input. The confidence interval to be represented as a fraction. In other words 95% has to be entered as 0.95. The degrees of freedom is the number of data points you have minus 1 (N-1). Allowed values are between 1 and 120.