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.