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Foreword J van Ettinger
The Preliminary Investigation
Preliminary Formulation of Problem Area
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accuracy achieved appendix attitude average blank scores C-group chapter chart check-charts checking compared comparison conclusions control group cross-chart cuttings deviations drawings E2-group effect of visual entation error points experimental group factors favorable effect favorable influence figure foreman formulated gauging girls graph important incentive effect indicated Industrial Quality Control industrial situation influence of visual informative effect inspector interview investigation job satisfaction laboratory experiments manufacturing mass production means measured ment method mistakes motives negative feedback negative reasons Netherlands norm number of error objective observed one-tailed opinion possible presentation of quality problem procedure product quality Published by permission quality consciousness quality incentives questionnaire R-chart random sample random tests realistic insight regarded requirements secondary hypotheses self-evaluation social stage statistical quality control statistical random strips Theorem three groups tion total number Treebeek validation various visible visual pres visual presentation week Wilcoxon's symmetry test worker