You have conducted a single-factor experiment for a chemical process investigating the effect of three levels of catalyst on reaction rate. You used three replications and randomized the order of the runs. You obtained the following output from Minitab. Interpret the results and make a recommendation for the level of catalyst given that maximum reaction rate is desired. One-way ANOVA: Rate versus Catalyst Source DF SS MS F P Catalyst 2 19872 9936 57.69 0.000 Error 6 1033 172 Total 8 20906

S=13.12 R-Sq=95.06% R-Sq(adj)=93.41% Individual 95% CIs For Mean Based on Pooled StDev Level N Mean StDev -----+---------+---------+---------+---- 1 3 150.00 5.00 (----*---) 2 3 118.33 20.82 (----*---) 3 3 38.33 7.64 (----*---) -----+---------+---------+---------+---- 40 80 120 160 Pooled StDev = 13.12

*Please reference example 7.1 on page 164