PsychAssessment
Quantitative Aspects of Psychological Assessment

Confidence Interval

This Page Calculates the Confidence Intervals for a test score.

By default it uses the Traditional Method. Optionally you can calculate
using the Modern Method as Well (see Module 4, Section11 for explaination)

If you enter a cut-off value, it will also calculate the probability
of scoring beyond the cut-off

Enter Test Score
Enter Test reliability
Enter Test Mean
Enter Test Standard Deviation
Cut-Off value (optional)
Optionally Calculate using the Modern Method as Well
Show Calculations in results

Calculator Disclaimer: This calculator has been developed for educational purposes, so that psychologists can learn to apply psychometric formula to clinical situations. It has been tested and validated with data from examples used to teach psychometrics on this site. It has not been tested or validated with a wide range of clinical data. Therefore we cannot offer any guarantee that the results of any calculation applied to clinical data is appropriate, accurate or valid.