9. Calculation
9.1 Average the final readings for sediment in the two tubes containing the sample to obtain the volume of sediment per 100-mL sample. Report the result to the nearest 0.001 %.
10. Precision and Bias
10.1 The precision of this test method as determined by statistical examination of interlaboratory results is as follows:
10.1.1 Repeatability - The difference between two test results, obtained by the same operator with the same apparatus under constant operating conditions on identical test material, would in the long run, in the normal and correct operation of the test method, exceed the following values only in one case in twenty:
10.1.2 Reproducibility - The difference between two single and independent results obtained by different operators working in different laboratories on identical test material would, in the long run, in the normal and correct operation of the test method, exceed the following values only in one case in twenty:
10.1.3 Bias - Test Method D2273 is empirical and no statement of bias can be made.
11. Keywords
11.1 lubricating oils; trace sediment