Coefficient of Variation. The coefficient of variation enables analysts to compare the variability of two data sets that are measured on different scales. The coefficient of variation (CV) itself does not have a unit of measure. Larger values of CV indicate greater variability or spread. The coefficient of variation is given as

Use this measure of variability for Exercises 82 and 83.

Question 3.195

82. Coefficient of Variation for Fuel Economy Data.

Refer to Table 7 on page 123.

  1. Calculate the coefficient of variation for the following variables: cylinders, engine size, and city mpg.
  2. According to the coefficient of variation, which variable has the greatest spread? The least variability?