Document ID: chunk:federal_register_of_legislation:F2011C00805:front:0:p36
Version: federal_register_of_legislation:F2011C00805
Segment Type: other
Provision Reference: 
Character Range: 101096–102789

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)