7.9.2 Measures of Variations

Definitions:

• • Measures of Variation --> Used to describe the distribution of the data

  • Range --> The difference between the greatest data value and the least data value

  • Quartile --> Values that divide the data into four equal parts (essentially quarters)

  • Lower Quartile --> The median of the lower half of a set of data

  • Upper Quartile --> The median of the upper half of a set of data

  • Interquartile Range --> The upper quartile minus the lower quartile

  • Outlier --> An extreme data value that is either much greater or much less than the median