a. Results of the reliability analysis
Post-performance test contains seven questions that have a slightly different with the questions in the pre- performance test. Performance test used to measure student performance after using Geogebra contents. This test includes control groups and experimental groups. The test was reliable at r =0.609-0.863 (p <0.05) and is described in detail in the following table.
![](https://stage.geogebra.org/resource/Aqp67pdF/cYYHOXaAwboyCigA/material-Aqp67pdF.png)