## The application of statistical methods to industrial standardisation and quality control |

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Appendix applied assignable causes average breaking strength bricks British Standard Specification British Standards Institution calculation cent central values chance causes clauses coefficient of variation consignment sampling control charts control limits definite diagram discussed distribution curve drawn due to chance E. S. Pearson estimate example factors fall fiducial limits Figure follows frequency distribution Fuel given in Table Grade illustration important lamps large number level of control malleable iron castings manufacture material mean and standard mean deviation mean value minimum necessary Normal curve Normal distribution number of observations number of units obtained output percentage ash-content points possible problems producer's production random sample range of variation reliability representative sample routine sample mean samples containing SECTION securing conformity Shewhart shown standard deviation standard error statistical analysis statistical methods statistical theory statistically uniform sub-groups Table 13 taken tensile strength termed test records variability wagon