  In this paper in which we address the evaluation of measurement process
quality, we mainly focus on the evaluation procedure, as far as it is based on
the numerical measurement outcomes. We challenge the approach where the "exact"
value of the observed quantity is compared to the error interval obtained from
the measurements under test and we propose a procedure where reference
measurements are used as "gold standard". To this purpose, we designed a
specific t-test procedure for this purpose, explained here. We also describe
and discuss a numerical simulation experiment demonstrating the behaviour of
our procedure.
