Statistical Education for Engineers: an Initial Task Force Report Author(S): Robert V
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Statistical Education for Engineers: An Initial Task Force Report Author(s): Robert V. Hogg Source: The American Statistician, Vol. 39, No. 3 (Aug., 1985), pp. 168-175 Published by: Taylor & Francis, Ltd. on behalf of the American Statistical Association Stable URL: http://www.jstor.org/stable/2683924 Accessed: 24-11-2015 10:16 UTC Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at http://www.jstor.org/page/ info/about/policies/terms.jsp JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact [email protected]. Taylor & Francis, Ltd. and American Statistical Association are collaborating with JSTOR to digitize, preserve and extend access to The American Statistician. http://www.jstor.org This content downloaded from 163.117.20.121 on Tue, 24 Nov 2015 10:16:11 UTC All use subject to JSTOR Terms and Conditions StatisticalEducation forEngineers: An Initial Task Force Report ROBERT V. HOGG et al.* 1. Identifythe customersand theirspecific statistical A three-dayworking conference to developrecommenda- needs; tionsfor the statistical education of engineerstook place at 2. Outlineindustrial training programs for practicing theUniversity of Iowa in July1984. Althoughother areas, engineersand a reasonablefirst course for undergraduate suchas business,chemistry, and biology, are also important engineeringstudents to satisfythese needs, based on the to improvingthe productsof industry,we restrictedour clear identificationof theneed forapplied statistics; considerationto engineering.This reportof the findings 3. Identifyresource materials and definepedagogical addressesthe following questions: Who are thecustomers? approaches,as possible,to makethese programs effective. What are theirstatistical needs? What typesof courses, Of course,given thatthe audiencefor these programs given by the industryfor practicing engineers (called in- consistsof engineersand appliedscientists, statistical ap- house courses in thisreport), are desirable?How do we plicationsshould complementand reinforceengineering approachstatistical education for engineering management? conceptsand methods,particularly in laboratorypractice, Whattypes of resourcesare desirablefor instructional pur- developmentand assessmentof engineeringmodels, col- poses? Whatis the best firstcourse in statisticsfor engi- lectionand interpretationof data, productand processde- neeringstudents? How can we convincethe engineering sign,and productionand processcontrol. professionthat statistical ideas and methodscan help im- To utilizethe training that occurs effectively, engineering provequality and productivityin Americanindustry and managementmust understand and supportthe use of statis- thusits competitive position in theinternational market? ticaltools. Withoutthis understanding, there is a real pos- sibilitythat the statistical techniques will not be used.Although the conferencewas not able to focusextensive efforts on 1. INTRODUCTION howto buildsuch management awareness, there was a clear Therehas beenmuch publicity in recent years concerning consensusthat statistical education for engineers must also Americanindustry's inability to competesuccessfully in the includesome educationfor their managers. internationalmarketplace. Many of theseconcerns focus on One surprisingaspect of thework of theconference was improvingquality and productivity and thus the competitive thedegree to whichall participantsagreed-despite diverse positionof Americanindustry. To addressthese concerns experienceand occupations-on the basic statisticalcon- effectivelyrequires contributions from many disciplines. ceptsthat all engineersneed to appreciate.These include AppliedStatistics is one such discipline.It providesengi- 1. The omnipresenceof variability neerswith such usefultools as statisticalquality control, 2. The use of simple graphicaltools, such as histo- designof experiments, graphical data analysis, and powerful grams,scatterplots, probability plots, residualplots, and buteasy-to-use statistical computer packages. Yet manyof controlcharts thesetools are notbeing used in appropriateplaces. How 3. The basic conceptsof statisticalinference can thisbe in an age whentough worldwide competition 4. The importanceand essentialsof carefullyplanned leavesus littlechoice but to takeadvantage of all technical experimentaldesigns tools available?The answeris, in part,that American en- 5. The philosophiesof Shewhart,Deming, and other gineershave not been taughtabout these tools-and this practitionersconcerning the manufacturing of quality prod- situationneeds to be changed. ucts Withthis conviction, 42 statisticiansand engineerspar- ticipatedin a three-dayconference on statisticaleducation For manystatisticians and engineeringeducators, this forengineers at theUniversity of Iowa, Iowa City,July 23- reportreinforces the realizationthat an interdisciplinary, 25, 1984. cooperativeapproach is necessaryto respondto the chal- Our goals in thisconference were to lengesthat industry faces. It is imperativethat a dialogue betweenthe engineering and statisticalprofessions take place if majorgains are to be made in qualityand productivity. *RobertV. Hogg is Professor,Department of Statisticsand Actuarial Someof us atuniversities believe that there is littlechance Science,University of Iowa, Iowa City,Iowa 52242. The authorwants it madevery clear, however, that the other 41 participantsare also coauthors of persuadingacademic engineers to includemore statistics of thisreport; they and theiraffiliations are listedin the Appendix.In in theircurricula unless industry unmistakably demands it. particular,the team leaders H. T. David, WilliamGolomski, Bert Gunter, It is thereforeessential that influential industrial leaders and WilliamParr were extremelyhelpful, as was RichardGunst, who promotethe importanceof statisticalideas and methods. helpedprepare a preliminarydraft of thisreport. In addition,two other Certainlysuccessful applications provide our most con- statisticians,who did notattend, should be mentioned:Ron Snee, forhis suggestionsin theplanning stages of theconference, and GerryHahn, for vincingargument. This reportprovides some suggestions his recommendationsthroughout the entireprocess, particularly in the on what should be includedin these programs.It is an preparationof themanuscript. importantfirststep, and everyopportunity should be taken 168 The American Statistician, August 1985, Vol. 39, No. 3 ?) 1985 American Statistical Association This content downloaded from 163.117.20.121 on Tue, 24 Nov 2015 10:16:11 UTC All use subject to JSTOR Terms and Conditions to spreadthe word among practicing professional engineers ing,and aid in communication;Process flow diagrams; and and engineeringeducators. We invitereaders to sharetheir Paretodiagrams that quantify the priorities and list the "vital commentsand experienceswith us by contactingHogg. It few" keysof effectiveefforts. is clearthat the same type of conference concerning business 2. Fundamentals(Fund.) of data variabilityand basic statisticswould also be worthwhilefor the improvement of statisticalmethods for process understanding, control, and qualityand productivity.In anycase, progressin statistical improvementare absolutelynecessary. The engineermust educationshould be an ongoingeffort. understandwhat is observed:the actual value plus some randomvariable (noise). To improveproductivity and qual- 2. STATISTICAL AREAS IMPORTANT ity,reduction in the variabilityof theprocess is required. TO INDUSTRY Accordingly,there is a greatneed to have theprocess gen- eratedata that can be usedto monitor,control, and improve thatthe conference addressed was, Who Thefirst question theprocess. are thecustomers and whatare theirstatistical needs? The 3. Designof Experiments (DOX) indicateshow to probe answersresulted in twolists that then formed the rows and a processto getthe most information at minimalcost. We thecolumns of a matrix,the general element of whichre- shouldstress the interactive nature of experimentationand flectsthe amountof knowledgeneeded by thattype of howthis approach fits into the strategy of ongoing improve- engineerin thatparticular statistical area. Of course,the mentand process learning. That is, itshould be emphasized specificsof these classifications vary from company to com- thatstatistical methods are consistentwith and essentialin pany; but the participantsagreed that these-as generic the applicationof the scientificmethod. Topics to be in- distinctions-arebroadly applicable even though some spe- cludedin DOX includemeasurement error, independence, cificclassifications have been omitted. replicationversus duplication, randomization, blocking, main effects,full and fractionalfactorials (as comparedto the 2.1 Customers poorerone-at-a-time approach), interaction, confounding, Customerswere categorized along the following lines: responsesurface design, product robustness, nested designs and variancecomponents, evolutionary operation/plant ex- 1. Engineeringmanagement is responsiblefor the work perimentation,mixture designs, and acceleratedtesting. performedby thestatistically trained engineers. 4. StatisticalInference (S. Inf.)concerns the error struc- 2. Qualityengineers are responsiblefor product, ma- tureof an estimate.That is, engineersshould