## 3 Evaluation of Reaction Time Bias  
The hypothesis is considered that the bias of the average value when using web interfaces on various devices is a system discrepancy and can be configured programmatically, for example, by determining the type of operating system before the experiment. As the initial data, the results of a mass survey of students in the education system were used. The survey was conducted using the web platform [42; 43]. The study involved 3786 students of grades 7-9 (45.8% of boys) from secondary schools of the Russian Federation. The age of participants is 12.8-17.6 years. To assess the reaction time, two questions were chosen: one of them was placed in the beginning of the psychological methodology, the second one was the last question of the methodology. Both questions imply the choice of one answer from several being offered. The key criterion when choosing questions for analyzing the reaction time was the maximum ease of choosing an answer, that is, it is assumed that the respondent should give an answer without thinking. The selected questions are formulated as follows. The first question \"I enjoy spending time with my parents\" involves choosing one of the following answers: \"never\", \"sometimes\", \"often\", \"almost always\", \"always\". The last question is \"My friends will help me if necessary\" assumes the choice of one of the following answer options: \"never\", \"sometimes\", \"often\", \"almost always\", \"always\". Further, for each record, the total reaction time was calculated. The upper percentile was dropped with respect to the total reaction time. Too long reaction time is associated with a long pause in the process of filling out the questionnaire. The participant's reaction time \(R\) for each question was determined by the formula:  
\[R=Te-Ts, \tag{1}\]  
where \(Te\) is time when the user last changed their answer; \(Ts\) is time when the question first appeared on the screen. The questionnaires were filled out using various devices. Operating system versions were fixed using the library Platform.js v1.3.5 ([[https://www.npmjs.com/package/platform](https://www.npmjs.com/package/platform)]([https://www.npmjs.com/package/platform](https://www.npmjs.com/package/platform)), accessed on 22 September 2021). The OS field was used to determine the operating system. Based on operating systems, three groups were formed: Mobile Device, Legacy PC, and Modern PC. Groups were selected by the occurrence of text fragments from Table 1 in the OS field, and the group size was limited to 1000 records. The initial data is sorted in chronological order, the first records of 1000 records found by the specified criterion were selected into groups. The All Devices group was also formed, which includes the results of all three groups, in total containing 3000 records. \begin{table}
\begin{tabular}{c c} \hline \hline
**Group** & **Criteria** \\ \hline Mobile Device & “android” OR “ios” \\ Legacy PC & “windows” AND “xp” \\ Modern PC & “windows” AND (“7” OR “10”) \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Group-forming rules. For each of the groups, a statistical analysis was performed to determine the relationship between the response time when answering the questionnaire and the category of devices used. For question PQ106-01, the statistical evaluation showed that responding from mobile devices took less time for respondents than for modern PC users. At the same time, users of old PCs, as a rule, took even more time to choose an answer. The data are given in Table 2.  
For question PQ610, the results show (presented in Table 3) that respondents took longer to respond from mobile devices than modern PC users. Response times for older PC users are on average longer than modern PC users, but median response times are longer than for the other two categories. Distribution charts are presented in Appendix A, in Figures A1-A4 for question PQ106-01 and in Figures A5-A8 for question PQ610, respectively. Thus, the hypothesis under consideration was not confirmed by experiment.