Annex B.5
standard deviation have a common mean value.
B.4 Reporting of Test Results B.
When the various hypotheses have been tested, rejected or verified the application of the test
results is the next matter of concern. In structural engineering the characteristics in regard to
strength and deformation of components and systems are typically described in terms of
appropriately chosen fractile values (typically the lower 5% fractile value for material
characteristics). It is therefore appropriate to report the results of the experimental
investigation in terms of fractile values which are typically applied in the specific areas of
application. However, of course the reporting shall also include the above mentioned aspects
in addition.
When giving the fractile values of the dependent variables as a result it is important that the
uncertainties associated with the fractile value are specified and if necessary confidence
intervals for the fractile may be included as additional information. If the uncertainties
associated with the parameters of the distribution functions applied to describe the uncertain
dependent variable are included in the assessment of the fractile values (e.g. using the
Maximum Likelihood Method) the confidence intervals of course are not relevant.