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Figure 3: Subjective assessment of informational significance of the noise Questionnaire (50 coal miners and 46 operators were interviewed): According characteristics of noise you may identify that: 1. Equipment works normally 2. Equipment works with failure 3. Use this information 4. Prefer alarm signals According to characteristics of noise you may identify the situation when 5. There is a threat of your safety 6. There is a threat of your colleagues' safety 7. Use this information (For all couples P < 0.05 according φ * - angular Fishers criterion)

Figure 3: Subjective assessment of informational significance of the noise Questionnaire (50 coal miners and 46 operators were interviewed): According characteristics of noise you may identify that: 1. Equipment works normally 2. Equipment works with failure 3. Use this information 4. Prefer alarm signals According to characteristics of noise you may identify the situation when 5. There is a threat of your safety 6. There is a threat of your colleagues' safety 7. Use this information (For all couples <i>P</i> < 0.05 according φ * - angular Fishers criterion)