ECON 2500 Lecture Notes - Lecture 13: Llers, Walter A. Shewhart, Granular Material
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We might attempt to attain high quality by careful i(cid:374)spe(cid:272)tio(cid:374) of the (cid:374)ished p(cid:396)odu(cid:272)t o(cid:396) (cid:396)e(cid:448)ie(cid:449)i(cid:374)g e(cid:448)e(cid:396)(cid:455) outgoi(cid:374)g i(cid:374)(cid:448)oi(cid:272)e a(cid:374)d e(cid:454)pe(cid:374)se account payment. The choice requires that you understand the process well enough to know where problems are likely to arise: flowcharts and cause-and effect diagrams can help. It should be clear that control (cid:272)ha(cid:396)ts that (cid:373)o(cid:374)ito(cid:396) o(cid:374)l(cid:455) the (cid:374)al output a(cid:396)e often not the best choice. Rational subgroups: the interpretation of control charts depends on the distinction between x-type special causes and s-type special causes. Walter shewhart, the founder of statistical process control, used the term rational sub group to emphasize that we should think about the rational subgroup process when deciding how to choose samples. A random sample would contain tablets spread across the entire 10 minutes. It fairly represents the 10-(cid:373)i(cid:374)ute pe(cid:396)iod, (cid:271)ut that is(cid:374)"t (cid:449)hat (cid:449)e (cid:449)a(cid:374)t fo(cid:396) p(cid:396)o(cid:272)ess (cid:272)o(cid:374)t(cid:396)ol.