Weights (kg) of poplar trees were obtained from trees planted in a rich and moist region. The trees were given different treatments identified in the table below. The data are from a study conducted by researchers at Pennsylvania State University and were provided by Minitab, Inc. Use a 0.05 significance level to test the claim that the four treatment categories yield poplar trees with the same mean weight. Is there a treatment that appears to be most effective? Use analysis of variance for the indicated test.

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No Treatment 1.21 0.57 0.56 0,13 1.30 Fertilizer 0.94 0.87 0.46 0.58 1.03 Irrigation 0.07 0.66 0.10 0.82 0.94 Fertilizer and Irrigation 0.85 1.78 1.47 2.25 1.64 2