Research Report RR:B09-1002

    This report presents the data and calculated repeatability intervals I (r) and reproducibility intervals I (R) for the test method on compressibility, B331. These intervals or ranges are needed to construct the mandatory precision statements for B331. The interpretation of I (r), repeatability interval is as follows: on the basis of test error alone, the difference in absolute value, of two test results obtained in the same laboratory on the same material will be expected to exceed I (r) only about 5% of the time. Thus, if such a difference is found to be larger than I(r), there is reason to question one or both of the test results. Similarly, I(R), describes the difference between single tests done in separate laboratories. If the absolute difference between two such tests on the same material exceeds I(R), there is reason to question the results of one or both tests, because I(R) is exceeded only 5% of the time.

    Published: July 1985

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    Related Standards

    B311-17 Standard Test Method for Density of Powder Metallurgy (PM) Materials Containing Less Than Two Percent Porosity


    Committee B09 on Metal Powders and Metal Powder Products


    Subcommittee B09.02 on Base Metal Powders