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The objective of average fiber diameter measurement is to determine the grade of a lot of wool with a reasonable degree of certainty. A sequential sampling plan for each of the 16 U.S. Department of Agriculture (USDA) grades of grease wool was developed in an effort to reduce the minimum number of fiber measurements specified for grade determination. The sequential sampling plan was applied to 61 samples representing 14 USDA grades of grease wool. Forty-four (72%) of the samples were determined to be in the proper grade on a sequential basis before the currently prescribed minimum number of fibers were measured.
HeadMember of ASTM, Wool & Mohair Standards Laboratory, Agricultural Marketing Service, U.S. Department of Agriculture, Denver, Colo.
Chief, Statistics Branch, Technical Services Division, Agricultural Marketing Service, U.S. Department of Agriculture, Washington, D.C.,
Stock #: JTE11385J