Explain in what sense the analysis of variance involves actually analyzing variance—in particular, what variances are analyzed and why?
Answer to relevant QuestionsWhy can the standard error of the average difference be a different number depending on which samples you are comparing? When may you use the least-significant-difference test to compare individual pairs of samples? When is this not permitted? Use multiple regression with indicator variables, instead of one-way ANOVA, to test whether the quality data in Table 15.1.1 show significant differences from one supplier to another. (You may wish to review the material on ...Refer to the data for problem 1. a. Find the critical value from the F table at the 0.1% level and report the result of the F test at this level. b. Summarize what this test has told you about any differences among these ads ...Answer the parts of exercise 1 using experience in place of annual salary. a.* Draw box plots to compare these three groups. Comment on what you see. b.* Find the average for each training level, and comment. c.* Find the ...
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