Power plant pollution: Sulfur dioxide (SO2) is a chemical produced by many industrial processes. It is one of the ingredients in acid rain, so it is important to monitor the amount of sulfur dioxide that is released into the atmosphere. In an article published in the journal Atmospheric Environment, several measurements of the maximum hourly concentrations (in milligrams per cubic meter) of SO2 were reported for each of four power plants. The results were as follows.
a. Because the design is unbalanced check that the assumption of equal variances is satisfied by showing that the largest sample standard deviation is less than twice as large as the smallest one. b. Construct an ANOVA table.
Answer to relevant QuestionsPower plant pollution: Using the data in Exercise 10, perform the Tukey—Kramer test to determine which pairs of means, if any, differ. Use the a = 0.05 level of significance. Using the data in Exercise I, can you conclude that the pH differs with the amount of gypsum added? Use the a = 0.05 level of significance. Why does a large value of the F statistic provide evidence against the null_hypothesis that all the population means are equal? Why doesn't a small value of F statistic provide evidence against Ho? Do college students tend to gain or lose weight during their freshman year? Following are a sample of weights of 15 college freshmen at the beginning and at the end of their freshman year. Can you conclude that the median ...Twelve different locations on a tire were measured once by each gauge. The results, in millimeters, were as follows Can you conclude that the median measurement differs between the gauges? Use the a = 0.05 level of ...
Post your question