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the standardized deviations to the limit is calculated using the following formula:
A.1.5. Then:
(a) If the test statistic result is greater than the pass decision number for the sample size given in Table 2, a pass decision is reached for the pollutant;
(b) If the test statistic result is less than the fail decision number for the sample size given in Table 2, a fail decision is reached for the pollutant;
(c) Otherwise, an additional engine is tested according to paragraph 8.3.2. and the calculation procedure is applied to the sample increased by one more unit.

       Table 2
       Pass and fail decision numbers of Appendix 1 sampling plan
       Minimum sample size: 3
Cumulative number of engines tested (sample size)  Pass decision number An  Fail decision number Bn