32: Interquartile Range: Percentile Ranks

 

Interquartile Range

Interquartile Range = the score representing the 75th precentile minus the score at the 25th percentile

IOW: The Rane of the middle 50% of scores

= 84 – 70

=14

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Semi-Interquartile Range = Interquartile Range divided by 2

= 14 / 2

= 7