A chicken farm came up with 4 different ways of mixing chicken feeds. The feeds were tested on 20 chickens. The results, given in terms of the chickens’

weight, are presented in the accompanying table. Do a 5 % test of the hypothesis that the weights resulting from the different feeds are approximately the same.

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Group A 4.5 4.4 4.5 4.3 4.9 B 4.2 4.3 4.3 4.2 4.9 C 4.1 4.6 4.2 4.3 4.8 D 4.6 4.2 4.9 4.4 4.7