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shirley.ha
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HBS108 (Descriptive Stats) Mind Map on Measures of dispersion, created by shirley.ha on 10/09/2013.

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shirley.ha
Created by shirley.ha almost 12 years ago
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Measures of dispersiontell us how spread or dispersed the data are.indicate the spread or variety of people’s measurements in a distribution.Low dispersionHigh dispersionvalues are similarwide range of different valuesRangehighest no/- lowest noPercentileIQRStandard deviationuse of range is limited, because it tells us nothingabout how the data between these two extremesare spread.divide the data into 100 equalparts with equal numbers ofobservations in each part.help us to provide information aboutthe location of a score in respect toother scores.score at or below a certain percentage of scores lying in adistributionQuartilessets of values that divide thedistribution into four parts such equalnumber of observations in each partQ1Q2Q325%50%75%lower quartilemedianupper quartileis the companion to the median.indicates the range of values spanned by the middle 50% ofthe observationsQ3-Q1the companion to the mean.indicates the average distance oramount, by which each observationdiffers from the mean.descriptive statistic thatis the most commonlyused measure ofdispersion or spreaddenoted by σ, in thepopulation and SD or s inthe sampleused with the mean to describe thedistribution of observations.most widely used measure of dispersion,particularly with interval and ratio leveldataDouble click this nodeto edit the textClick and drag this buttonto create a new node