raw cm, all four features              0.967 +/- 0.045
sepal width in mm, no scaling          0.933 +/- 0.067
sepal width in mm, standardized        0.953 +/- 0.060
raw cm, distance-weighted votes        0.967 +/- 0.045
petal length and width only            0.960 +/- 0.044
