A purification process for a chemical involves passing it, in solution, through a resin on which impurities are adsorbed. A chemical engineer wishing to test the efficiency of 3 different resins took a chemical solution and broke it into 15 batches. She tested each resin 5 times and then measured the concentration of impurities after passing through the resins. Her data were as follows:

Concentration of Impurities

Resin I Resin II Resin III

.046. 038 .031

.025. 035 .042

.014 .031 .020

.017 .022 .018

.043 .012 .039

Test the hypothesis that there is no difference in the efficiency of the resins.