Standard deviation

• Caution must be exercised when using standard
  deviation as a comparative index of dispersion
  Weights of newborn
  elephants (kg)
  929 853
  878 939
  895 972
  937 841
  801 826

Weights of newborn

mice (kg)

0.72 0.

0.63 0.

0.59 0.

0.79 0.

1.06 0.

n=10, = 887.1, sd = 56.50X n=10, = 0.68, sd = 0.255X

Incorrect to say that elephants show greater variation for birth-weights

than mice because of higher standard deviation