The assessment of the uncertainty of measurement results, an essential problem in environmental
acoustic investigations, is undertaken in the paper. An attention is drawn to the – usually omitted –
problem of the verification of assumptions related to using the classic methods of the confidence intervals
estimation, for the controlled measuring quantity.
Especially the paper directs attention to the need of the verification of the assumption of the normal
distribution of the measuring quantity set, being the base for the existing and binding procedures of
the acoustic measurements assessment uncertainty. The essence of the undertaken problem concerns
the binding legal and standard acts related to acoustic measurements and recommended in: ‘Guide
to the expression of uncertainty in measurement’ (GUM) (OIML 1993), developed under the aegis of
the International Bureau of Measures (BIPM). The model legitimacy of the hypothesis of the normal
distribution of the measuring quantity set in acoustic measurements is discussed and supplemented by
testing its likelihood on the environment acoustic results.
The Jarque-Bery test based on skewness and flattening (curtosis) distribution measures was used
for the analysis of results verifying the assumption. This test allows for the simultaneous analysis of
the deviation from the normal distribution caused both by its skewness and flattening. The performed
experiments concerned analyses of the distribution of sound levels: LD, LE, LN, LDWN, being the basic
noise indicators in assessments of the environment acoustic hazards.
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