Statistics

Standard Deviation

Measure of data spread

  • High school
  • about 4 min
  • 2 of 4 in the family
Not started
x̄=5.00±σ=2.002 (dev=-3.0)4 (dev=-1.0)4 (dev=-1.0)4 (dev=-1.0)5 (dev=0.0)5 (dev=0.0)7 (dev=2.0)9 (dev=4.0)
σ2=∑(x−xˉ)2n=4.000\sigma^2 = \frac{\sum(x-\bar{x})^2}{n} = 4.000
σ=2.0000\sigma = 2.0000

Standard deviation σ measures how spread out data is around the mean. The colored lines show each point's deviation from the mean.