

![0_image_0.png](0_image_0.png) 
Figure 5 gives an idea of the average levels of errors done by the participants at the beginning (left) and closing (right) phases of work with the RWR program. Every vertical segment denotes one participant, and its distance from the reference point corresponds to the calculated mean errors. The theoretical mean error in case of random clicking is denoted by the segment "R".

As it follows from the presented data, the solvers showed bad results of the work at the beginning phase. It means that they did more errors than the nonsolvers but also even more that would be in case of random clicking. In particular, the participant "M", who was most effective from the point of view of number of clicks done (see table), showed worst result at the beginning phase.

Unfortunately, small numbers of "right" clicks by participants "M", "B",
and "Ch" do not allow us to speak of an estimation of statistical significance of the difference from "R". Using the method of confidence intervals gives us an opportunity to establish the 95%-level difference from "R" only for participants "K" and "G" that did 21 and 20 "right" clicks, correspondingly, at the beginning phase.

The closing phase looks radically different from the beginning phase (Fig.