In this article, the steps taken in setting up a quality control system are discussed. These include preliminary investigations, general analyses of variance, collection of populations of data, determination of sample size, setting of control limits, use of control charts, and various statisti cal comparisons. For each of these, common statistical tools have been put to practical use. The steps used for a three-factor analysis of variance are given in detail.
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References
1.
Freeman, " Industrial Statistics," New York, John Wiley and Sons, 1942.
2.
Brownlee, " Industrial Experimentation," Brooklyn, Chemical Publishing Co., 1948.
3.
Committee D-13 A.S.T.M.Standards on Testing Materials—Appendix V, Proposed Recommended Practice for Calculating Number of Tests, Philadelphia, 1949.
4.
Grant, " Statistical Quality Control," New York, McGraw-Hill Book Co., 1946.
5.
Class notes from the following M.I.T. courses: 2.905, 2.906, Ec. 36.
