Statistics

The machine shop suspects that not only the lathes are the cause of variability but also the suppliers of tools have some variability. The shop uses 3 suppliers for cutting tools. The shop decides to test the 4 lathes with tools from each supplier. For each combination of tool and lathe, the shop cuts 4 parts. The data is as follows: Supplier 1 Supplier 2 Supplier 3 Machine 1 25.02, 25.06, 25.07, 25.09 24.87, 24.89, 24.91, 24.92 24.92, 24.95, 24.96, 24.99 Machine 2 25.03, 25.05, 25.06, 25.08 24.95, 24.96, 24.99, 25.02 24.91, 24.93, 24.95, 25.01 Machine 3 24.99, 25.01, 25.03, 25.05 24.94, 24.98, 25.02, 25.04 24.98, 24.92, 24.93, 24.96 Machine 4 25.05, 25.08, 25.09, 26.02 25.02, 25.03, 25.06, 25.07 25.00, 25.02, 25.03, 25.03 Determine the significant effects. Use both MATLAB’s anova2 and anovan.