# The Use of Artificial Intelligence for Assessing the Pro-Environmental Practices of Companies
## 2 Materials and Methods
### Statistical Analysis  
The results obtained are presented in percentage values in comparison with the maximum number of possible positive results (Table 2). This breakdown of results permits an observation of the differences in the environmental activity between companies of various sizes, as well as the differences in the environmental engagement of companies at various stages of the product's life cycle [61; 62]. Each respondent could obtain a maximum of \(m_{pl}\) positive answers in the \"Product design\" (as the first stage of the product's life cycle) group of questions (if all answers to the questions in this group would be \"Yes\" for questions with \"yes/no\" answers), or all the answers would be selected (for the remainingquestions in this group). The numbers of the surveyed companies are denoted as \(n_{SME}\) and \(n_{L}\); thus, the result of the equation \(z_{pd,\;SME}=m_{pd,\;SME}\;n_{SME}\) equals 100% of positive opinions for SMEs surveyed during this stage. The same concerned the LEs (\(z_{pd,\;L}=m_{pd,\;L}\;n_{L}\)). The proportion of positive answers provided by the respondents to the maximum number of possible positive answers provided a percentage value that represents the level of fulfilment of environmental requirements at a certain stage of the product life cycle. The same calculations were used for the remaining stages of the product's life cycle (\(z_{pm}\) product manufacturing, \(z_{pu}\) product use, and \(z_{pr}\) product recycling).  
\begin{table}
\begin{tabular}{c c c} \hline \multicolumn{3}{c}{**Proportion of Positive Answers to the Maximum Possible Number of Positive Answers**} \\ \hline
**Product Design** & **Small and Medium-Sized Enterprises** & **Large-Sized Enterprises** \\ \hline Positive & 165 & 245 \\ \hline Neutral & 31 & 14 \\ \hline Negative & 53 & 31 \\ \hline Final result & \(165-53=112\) & \(245-31=214\) \\ \hline Obtained & 112 & 214 \\ \hline Max & 525 & 525 \\ \hline Percentage value & \(112/525\times 100\%=21\%\) & \(214/525\times 100\%=41\%\) \\ \hline Product manufacturing & Small and medium-sized enterprises & Large-sized enterprises \\ \hline Positive & 92 & 114 \\ \hline Neutral & 12 & 10 \\ \hline Negative & 13 & 9 \\ \hline Final result & 92 – 13 = 79 & \(114-9=105\) \\ \hline Obtained & 79 & 105 \\ \hline Max & 300 & 300 \\ \hline Positive & \(79/300\times 100\%=26\%\) & \(105/300\times 100\%=36\%\) \\ \hline Product use & Small and medium-sized enterprises & Large-sized enterprises \\ \hline Positive & 117 & 130 \\ \hline Neutral & 6 & 4 \\ \hline Negative & 28 & 41 \\ \hline Obtained & 89 & 89 \\ \hline Max & 450 & 450 \\ \hline Percentage value & \(89/450\times 100\%=20\%\) & \(89/450\times 100\%=20\%\) \\ \hline Product recycling & Small and medium-sized enterprises & Large-sized enterprises \\ \hline Positive & 59 & 73 \\ \hline Neutral & 6 & 7 \\ \hline Negative & 3 & 0 \\ \hline Final result & \(59-3=56\) & \(73-0=73\) \\ \hline Obtained & 56 & 73 \\ \hline Max & 240 & 240 \\ \hline Percentage value & \(56/240\times 100\%=23\%\) & \(73/225\times 100\%=29\%\) \\ \hline \end{tabular}
\end{table}
Table 2: The proportion of positive answers to the maximum possible number of positive answers.