The-Where-Why--and-How-of-Data-Collection课件.ppt
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1、Business Statistics:A Decision-Making Approach6th EditionChapter 1Chapter 1The Where,Why,and How of Data CollectionChap 1-1Business Statistics:A Decision-Making Approach,6e 2005 Prentice-Hall,Inc.Chapter GoalsAfter completing this chapter,you should be able to:nDescribe key data collection methodsnK
2、now key definitions:Population vs.Sample Primary vs.Secondary data typesQualitative vs.Qualitative data Time Series vs.Cross-Sectional datanExplain the difference between descriptive and inferential statisticsnDescribe different sampling methods2Business Statistics:A Decision-Making Approach,6e 2005
3、 Prentice-Hall,Inc.nDescriptive statisticsnCollecting,presenting,and describing datanInferential statisticsnDrawing conclusions and/or making decisions concerning a population based only on sample dataTools of Business Statistics3Business Statistics:A Decision-Making Approach,6e 2005 Prentice-Hall,I
4、nc.Descriptive StatisticsnCollect datane.g.Survey,Observation,ExperimentsnPresent datane.g.Charts and graphsnCharacterize datane.g.Sample mean=4Business Statistics:A Decision-Making Approach,6e 2005 Prentice-Hall,Inc.Survey Design StepsnDefine the issuenwhat are the purpose and objectives of the sur
5、vey?nDefine the population of interestnFormulate survey questionsnmake questions clear and unambiguousnuse universally-accepted definitionsnlimit the number of questions6Business Statistics:A Decision-Making Approach,6e 2005 Prentice-Hall,Inc.Survey Design StepsnPre-test the surveynpilot test with a
6、 small group of participantsnassess clarity and lengthnDetermine the sample size and sampling methodnSelect Sample and administer the survey(continued)7Business Statistics:A Decision-Making Approach,6e 2005 Prentice-Hall,Inc.Types of QuestionsnClosed-end QuestionsnSelect from a short list of defined
7、 choicesExample:Major:_business_liberal arts _science_other nOpen-end QuestionsnRespondents are free to respond with any value,words,or statementExample:What did you like best about this course?nDemographic QuestionsnQuestions about the respondents personal characteristicsExample:Gender:_Female _ Ma
8、le8Business Statistics:A Decision-Making Approach,6e 2005 Prentice-Hall,Inc.Population vs.Sample a b c d ef gh i jk l m n o p q rs t u v w x y zPopulationSample b c g i n o r u y 10Business Statistics:A Decision-Making Approach,6e 2005 Prentice-Hall,Inc.Why Sample?nLess time consuming than a censusn
9、Less costly to administer than a censusnIt is possible to obtain statistical results of a sufficiently high precision based on samples.11Business Statistics:A Decision-Making Approach,6e 2005 Prentice-Hall,Inc.Statistical SamplingnItems of the sample are chosen based on known or calculable probabili
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