Page 1 of 1
J. Engle at al. (2004) explored wheat's resistance to a disease that causes leaf-spotting, shriveling, and reduced yield
Posted: Wed May 11, 2022 5:58 am
by answerhappygod
- J Engle At Al 2004 Explored Wheat S Resistance To A Disease That Causes Leaf Spotting Shriveling And Reduced Yield 1 (88.97 KiB) Viewed 23 times
J. Engle at al. (2004) explored wheat's resistance to a disease that causes leaf-spotting, shriveling, and reduced yield. Fields of soft red winter wheat were subjected to a certain pathogen during the summers of 2000-2002. Afterward, the fields were rated on a scale of 0 (resistant to the disease) to 10 (susceptible to the disease) Let 2000 be the mean rating of all fields for year 2000, 2001 be the mean rating of all fields for year 2001, and 4 2002 be the mean rating of all fields for year 2002. Suppose the sample size for year 2000 is 12000 = 14. Also, using the same notation, we have n 2001 = 16 and 1.2002 = 12. Suppose we are interested in evaluating if the population mean rating varies across years 2000 - 2002 using ANOVA. (a) What is the correct form of the null and alternative hypothesis? (1) Ho: 42000 = 42001 = 1.2002 HA: M2000+ H2001 + 2002 (2) Ho: M2000 = 12001 = P2002 = 0 HA 12000 + 42001 +42002 (3) Ho: M2000 = 42001 = 42002 HA: at least one mean is different (4) Ho 2000 2001 = | 2002 0 HA at least one mean is different The correct answer is option . [1 MARK] (b) The following table shows a partial output of the ANOVA table. Df Mean Sq F value Sum Sa 31.12 Pr(>F) 0.0008 Year Residuals Total 102.18 Use the table to calculate the following: (0.5 MARK each] SSE = Two decimal places dfg = dfe = MSG = Two decimal places MSE = Two decimal places