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Assessina Attainment of Standard
by f w o Stage Sampling
Debashis Kushary
Rutgers University Camden
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Abstract: Consider assessing a process whether it complies with
the regulation or not. Often it is done in two stages as described in
EPA (1986) guide SW-846 (pp nine-14 to nine-17). In the first stage,
sample mean of the measurements and then the upper (lower)
confidence bound are computed and compared against L, the
allowed maximum (minimum). If L is not in between the mean and
the confidence limit, then appropriate decision is made by looking
at which side L falls. If L is in between them, then a second set of
samples is taken and confidence limit is recomputed using all the
samples and again compared against L. If 100(la)% confidence is
desired in the procedure then a different value of a should be used
to maintain the over all error level at a because the first sample is
biased. Atwood and Bryan (Environmetrics, 1995) provided tables
and curves for practitioners for normally distributed data. This
paper deals with the nonparametric solution to this problem using
bootstrap methodology.