. The Bell System technical journal . TOLERANCE TIMES SAMPLE SIZE [p^n = (tolerance fraction defective)(sample size)]Fig. 3—Curves for finding size of sample. A METHOD OF SAMPLING INSPECTION 625. 0 RATIO OF PROCESS AVERAGE TO TOLERANCE [p/p^. = (PROCESS AVERAGE FRACTION DEFECTIVE)/(TOLERANCE FRACTION DEFECTIVE)] Fig. 4—Curves for finding the minimum amount of inspection per lot. 626 BELL SYSTEM TECHNICAL JOURNAL inspected, such as the degree of control exerted by the producingagencies, or the protective measures which precede or follow theinspection step in question. Fo
. The Bell System technical journal . TOLERANCE TIMES SAMPLE SIZE [p^n = (tolerance fraction defective)(sample size)]Fig. 3—Curves for finding size of sample. A METHOD OF SAMPLING INSPECTION 625. 0 RATIO OF PROCESS AVERAGE TO TOLERANCE [p/p^. = (PROCESS AVERAGE FRACTION DEFECTIVE)/(TOLERANCE FRACTION DEFECTIVE)] Fig. 4—Curves for finding the minimum amount of inspection per lot. 626 BELL SYSTEM TECHNICAL JOURNAL inspected, such as the degree of control exerted by the producingagencies, or the protective measures which precede or follow theinspection step in question. For any Consumers Risk value, sets ofcharts similar to Figs. 2, 3, and 4 may be constructed. Other Methods of Inspection The above detailed discussion has been limited to one simplemethod of inspection. Single Sampling, in order to show how certainconcepts and principles may be applied with the aid of samplingtheory. The same principles are readily extended to a plan of doublesampling or of multiple sampling in which cases a second sample maybe examined if the first fails or a third, fourth, etc. examined if thepreceding samples fail, before resorting to a detailed inspection ofthe remain
Size: 1291px × 1936px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
