77714_02p (1).pptx - What you will learn in Chapter 2...

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What you will learn in Chapter 2What you will learn in Chapter 2Measures of central tendencyComputing the mean for a set of scoresComputing the mode and median for a set ofscoresSelecting a measure of central tendencyMeasures of central tendencyComputing the mean for a set of scoresComputing the mode and median for a set ofscoresSelecting a measure of central tendencySalkind, Statistics for People Who (ThinkThey) Hate Statistics 5th Edition, SAGE Inc.© 2014
Measures of Central TendencyMeasures of Central TendencyThe AVERAGE is a single score that bestrepresents a set of scoresAnother name for AVERAGES is Measuresof Central TendencyExamples include the mean, median, andmodeThe AVERAGE is a single score that bestrepresents a set of scoresAnother name for AVERAGES is Measuresof Central TendencyExamples include the mean, median, andmodeSalkind, Statistics for People Who (ThinkThey) Hate Statistics 5th Edition, SAGE Inc.© 2014
Computing the MeanComputing the Mean(X Bar) is the mean value of the group of scores(sigma) tells you to add together whatever follows itXis each individual score in the groupThenis the sample size(X Bar) is the mean value of the group of scores(sigma) tells you to add together whatever follows itXis each individual score in the groupThenis the sample sizeSalkind, Statistics for People Who (ThinkThey) Hate Statistics 5th Edition, SAGE Inc.© 2014
Steps to Computing the MeanSteps to Computing the Mean1.List the entire set of values in one or morecolumns.These are all the Xs.2.Compute the sum or total of all the values.3.Divide the total or sum by the number ofvalues.1.List the entire set of values in one or morecolumns.These are all the Xs.2.Compute the sum or total of all the values.3.Divide the total or sum by the number ofvalues.Salkind, Statistics for People Who (ThinkThey) Hate Statistics 5th Edition, SAGE Inc.© 2014
Things to remember…Things to remember…N = populationn= sampleSample mean is the measure of central tendency that bestrepresents the population meanIt is also called the arithmetic meanMean is the centermost point where all the values on one side of themean are equal in weight to all the values on the other side of themeanMean is VERY sensitive to extreme scores that can “skew”or distort findingsN = populationn= sampleSample mean is the measure of central tendency that best

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