Document ID: chunk:federal_register_of_legislation:F2008C00323:front:0:p37
Version: federal_register_of_legislation:F2008C00323
Segment Type: other
Provision Reference: 
Character Range: 103497–105397

VERIFYING THE CONFORMITY OF PRODUCTION REQUIREMENTS IF THE PRODUCTION STANDARD DEVIATION GIVEN BY THE MANUFACTURER IS SATISFACTORY

        1.  This Appendix describes the procedure to be used to verify the production conformity for the Type I test when the manufacturer's production standard deviation is satisfactory.

        2.  With a minimum sample size of 3, the sampling procedure is set so that the probability of a lot passing a test with 40 per cent of the production defective is 0.95 (producer's risk = 5 per cent) while the probability of a lot being accepted with 65 per cent of the production defective is 0.l (consumer's risk = 10 per cent).

        3.  For each of the pollutants given in paragraph 5.3.1.4. of this Regulation, the following procedure is used (see Figure 2 of this Regulation).

        Taking:

            L  = the natural logarithm of the limit value for the pollutant,

            xi  = the natural logarithm of the measurement for the i-th vehicle of the sample,

            s  = an estimate of the production standard deviation (after taking the natural logarithm of the measurements),

            n  = the current sample number.

        4.  Compute for the sample the test statistic quantifying the sum of the standard deviations from the limit and defined as:

5.   Then :

        5.1.  If the test statistic is greater than the pass decision number for the sample size given in Table (1/1 below), the pollutant is passed.

        5.2.                              If the test statistic is less than the fail decision number for the sample size given in Table (1/1 below), the pollutant is failed; otherwise, an additional vehicle is tested and the calculation reapplied to the sample with a sample size one unit greater.

Table 1/1

Cumulative number
of tested vehicles     Pass decision threshold  Fail decision threshold
(current sample size)