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Session-3 - Statistics.docx

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Department
Quantitative Methods
Course
QMS 102
Professor
Amy Peng
Semester
Winter

Description
Business Statistics I Dr Changping WangExample4Consider the following frequency distributions of the test scores for two different sectionsScore of students in Sec 1 of students in Sec 240and under 5014 550and under 6030 1360and under 7060 2770 and under 8045 2580 and under 9031 2090 and under 10020 10NotethatthereisalargedifferenceinthenumberofstudentsinthetwosectionsSoitisdifficulttocomparethetestscoredistributionbylookingatthefrequenciesWeneedtosetuparelativefrequencyorpercentagedistributionfortwosetsoftestscoresRelativeFrequencyofaclassPortionorpercentageofthedatathatfallsinaparticularclassfrfnrelativefrequencyisgivenbyTherfwherefistheclassfrequencyandnisthesamplesizeSession3Page1Business Statistics I Dr Changping WangExample5ForthefrequencydistributioninExample3constructarelativefrequencydistributionMinutestheyspentofSubscribers1andunder10210andunder20520andunder30730andunder401140andunder50750andunder60960andunder70370andunder80480andunder902Session3Page2
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