A grain processor has two corn crops with aflatoxin levels below 20 parts per billion and are safe for human consumption. However, because aflatoxin varies widely across yields, he wants to compare the levels of aflatoxin in each of the yields.

This example uses the file aflatoxin20.sav. Use the two-sample Kolmogorov-Smirnov test to determine whether the distribution of aflatoxin differs significantly between the two safe yields.