On this page you can compare test results of different persons with each other.
You have to select one person in “Settings and information” in order for data to be displayed.
Norm-referenced score confidence interval scaling
The resulting lower and upper bounds of the norm-referenced score confidence interval are then scaled based on zα value chosen:
Using the formulas
where
-
X is the observed score at the respective test session in the selected score scale
-
-
1.96 is the critical value for a 95% confidence interval
-
zα is the critical value corresponding to the confidence level selected in VTS Analytics
This means that the width of the exported 95% confidence interval is proportionally adjusted to match the selected confidence level.