2.3. Statistical Analysis
POLAND
Statistica 13.3 (StatSoft, Krakow, Poland) was used for statistical analysis. The work presents the results classified as the so-called industry statistics, using both descriptive statistics (age, gender, yes/no data) and mathematical statistics.Based on data from the literature, it was assumed that the sample error was about 2% and the confidence level was about 96%. The Shapiro–Wilk test showed that there was no basis for rejecting the hypothesis that the data did not follow a normal distribution, followed by Student’s 