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17 D measuring spread of data

17 D measuring spread of data. To be able to describe a set of data we need to Measure both its 1) center and 2) its spread . Three distributions B and A has the same mean but different spreads. 4 different measures of spread. 1) range 2)interquartile range IQR 3) variance

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Section 13.4/13.5 MEASURES OF SPREAD

Section 13.4/13.5 MEASURES OF SPREAD. Measures of spread or variability is another way to compare data. Percentile Ranking : If a student is in the 75 th percentile, it means that the student finished higher than 75% of all the other students. For example, if scores on a test were as follows:

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17 D measuring spread of data

Section 13.4/13.5 MEASURES OF SPREAD