approximation

[Jessica Landeira]

Good afternoon! Me and my team are part of a University in Brazil. Where we studied Metallurgical Engineering. We are doing several experiments in the Experimental Physics class using Phyphox. We would like to know if the application makes approximations when calculating the experiments? How accurate is the resolts shown in Phyphox? What is the margin of error of the application? 
We are trying to run the outputs using the application and comparing with the conventional way in the physics lab. We have not come to any conclusions yet. What has been perceived by you guys?