Populationandsample8Thestatistical lawformedbyinhomogeneousqualityfeaturevaluesisdifferent,thusformed the different controlmethods。Totalobjectproducts neededtounderstandand controlortotalqualityfeaturevaluesfor expressing the natureof products,referredtoaspopulation。Randomdrawingpartsofunitproducts frompopulationcalledsample,Mesurequalityfeaturevaluesofthesample,inordertoestimateandjudgethecharacterofpopulationoThebasicidea ofqualitymanagement statistical methodistousethequalityfeaturevaluesof thesampletomake scientificinferencesorpredictiononthepopulation2007.4count value and measurement value21
2007.4 21 population and sample: count value and measurement value The statistical law formed by inhomogeneous quality feature values is different, thus formed the different control methods。 Total object products needed to understand and control or total quality feature values for expressing the nature of products , referred to as population。 Random drawing parts of unit products from population called sample，Mesure quality feature values of the sample,in order to estimate and judge the character of population。 The basic idea of quality management statistical method is to use the quality feature values of the sample to make scientific inferences or prediction on the population
Qualityinspectionusuallyusesthesamplingmethod,thatis,drawoutapartbf individualfromthepopulation,and testthequalitycharacteristicdataofeachindividual,Afterstatisticalanalysis,makeanestimateandjudgmentofthepopulation.opopulation8population also called parent population,it is the entire researchobjects。Abatchof parts,aprocess ortheentireproducts ofthesametypeproducts produced at a certain period all can be referred to as thepopulation。Individual8The basicunit that constitute the tatality,known as individuals.Eachpart, eachproduct isan individual。2007.4Data collection----population、22individual
2007.4 22 population: Data collection-population、 individual Individual: population also called parent population,it is the entire research objects 。 A batch of parts, a process or the entire products of the same type products produced at a certain period all can be referred to as the population。 The basic unit that constitute the tatality, known as individuals。 Each part, each product is an individual。 Quality inspection usually uses the sampling method，that is,draw out a part of individual from the population，and test the quality characteristic data of each individual ，After statistical analysis, make an estimate and judgment of the population
Onqualitymanagement,totalobjectproductsneededto understandandcontrolortotalqualityfeaturevaluesfor expressing the natureof products,referredtoaspopulation。Abatch of parts,a process ortheentireproducts of the same type productsproduced at a certain period all can bereferred to asthe populationThe basic unit that constitute the tatality, known asindividuals。Eachpart, eachproduct is an individual.Data collection----population,2007.423individual
2007.4 23 Data collection-population、 individual On quality management, total object products needed to understand and control or total quality feature values for expressing the nature of products , referred to as population。 A batch of parts, a process or the entire products of the same type products produced at a certain period all can be referred to as the population The basic unit that constitute the tatality, known as individuals。 Each part, each product is an individual
Theclassificationof thepopulation :Infinite population: contains countless individuals。For example:On a continuous production lineautomatic processing manufacture someparts,assumethattheproductionprocess has never stopped,thepopulation of these parts called infinite population ;Finite population: contains a finite number ofindividualsFor example, within a certain period of time, on acontinuous production line of automatic processingmanufacturesomeparts,thepopulation ofthesepartscalled finitepopulation;Data collection----population.2007.4individual24
2007.4 24 Data collection-population、 individual The classification of the population： Infinite population: contains countless individuals。 For example:On a continuous production line , automatic processing manufacture some parts , assume that the production process has never stopped, the population of these parts called infinite population； Finite population：contains a finite number of individuals。 For example, within a certain period of time, on a continuous production line of automatic processing manufacture some parts, the population of these parts called finite population；
Sample8Sampleisthegatherofa partofindividualsthatdrawnfromthepopulationinaccordancewiththeprincipleof random。 Randomprinciple,is,withoutanysubjectivetendency,completelyrelyonchancedrawingsamples,makeeachsamplehasequalopportunity。 Randomprincipleis thebasicprincipleofsamplingtechnology,onlydrawsampleunitinaccordancewiththe randomprinciple,cangetthesimilarsampleswiththepopulationData collection----population.2007.4?individual25
2007.4 25 Data collection-population、 individual Sample is the gather of a part of individuals that drawn from the population in accordance with the principle of random。Random principle, is ,without any subjective tendency, completely rely on chance drawing samples, make each sample has equal opportunity。Random principle is the basic principle of sampling technology, only draw sample unit in accordance with the random principle , can get the similar samples with the population。 Sample: