Four catalysts are used in a chemical process. Samples of yield data from the process for all catalysts are used to determine whether on average, there is a difference between the catalysts. Table Q2 shows the yield data from the process: Table Q2 Yield data from the chemical process Catalyst A B C D 34.4 33.1 17.6 28.3 25.7 35.2 30.1 33.5 27.5 31.1 30.5 31.2 31.2 31.6 26.6 27.1 26.0 42.8 32.2 32.2 34.3 33.9 28.7 33.4 21.4 26.3 40.2 29.0 Perform the analysis of variance at the 5% level of significance and indicate whether the average yield differ significantly for the 4 catalysts. Then, construct a 90% confidence interval on the difference between the average yield for catalyst A and D