Commercial fish raising is a growing industry in North America. What makes fish raised commercially grow faster and larger? Suppose that a fish industry study is conducted over the three summer months in an effort to determine whether the amount of water allotted per fish makes any difference in the speed with which the fish grow. The following data represent the amount of growth (in centimetres) of marked catfish in fish farms for different volumes of water per fish. Use α = 0.01 to test whether there is a significant difference in fish growth by volume of allotted water.

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4 L per Fish 2.8 3.6 4.3 3.3 4.8 3.6 5.3 20 L per Fish 7.4 6.4 6.6 5.6 5.3 5.1 6.9 40 L per Fish 7.9 6.1 7.6 5.8 7.4 4.8