Question: The following measurements were taken from hole diameters of metal drilled on your equipment that need to meet precise specifications. Three tools are being used for the drilling and the drilling is done during three different shifts. Assume the diameters are approximately normally distributed and the requirements for equal variances are met. Use the following Minitab two-way ANOVA output to answer the questions.

a) Is there a significant difference in the means for the three shifts and the three tools. (Explain.)

b) If there are significant differences in the means, which pairwise means differ? (Explain.)