Weights (kg) of poplar trees were obtained from trees planted in a sandy and dry 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 in the sandy and dry region? Use analysis of variance for the indicated test.
Answer to relevant QuestionsRefer to Data Set 10 in Appendix B and use the amounts of nicotine (mg per cigarette) in the king-size cigarettes, the 100-mm menthol cigarettes, and the 100-mm non-menthol cigarettes. The king-size cigarettes are ...If we use the data described in Exercise 1 with two-way analysis of variance, we get the accompanying display. What do you conclude? Data Set 14 in Appendix B includes highway fuel consumption amounts for cars with 4 cylinders, 6 cylinders, and 8 cylinders. Analysis of variance is used with the highway fuel consumption amounts (mi/gal) categorized ...The display below results from using the one-way analysis of variance test. a. What is the null hypothesis? b. Assuming a 0.05 significance level, what conclusion is indicated by the displayed results? Positive signs: 172; negative signs: 439; ties: 0 (from challenges to referee calls in the most recent U.S. Open tennis tournament) Assume that matched pairs of data result in the given number of signs when the value of the ...
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