13. Poplar Tree Weights 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 Data Set 18 in Appendix B, and they were obtained 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? No Treatment Fertilizer Irrigation Fertilizer and Irrigation 1.21 0.94 0.07 0.85 0.57 0.87 0.66 1.78 0.56 0.46 0.10 1.47 0.13 0.58 0.82 2.25 1.30 1.03 0.94 1.64
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Null hypothesis (H₀): The mean weights of poplar trees are the same for all four treatment categories. Alternative hypothesis (H₁): At least one treatment category has a different mean weight of poplar trees. Show more…
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Researchers at Pennsylvania State University conducted experiments with poplar trees. Listed below are weights (kg) of poplar trees given no treatment and poplar trees treated with fertilizer and irrigation. Find the range, SD, and variance of both datasets. Does there appear to be a difference between the two standard deviations? No treatment: 0.16, 0.03, 0.17, 0.38, 0.23 Fertilizer and irrigation: 2.04, 0.28, 0.93, 1.08, 2.39
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