In Design and Analysis of Experiments, 6th edition (John Wiley & Sons,2005), D. C. Montgomery describes an experiment that determined the effect of four different types of tips in a

hardness tester on the observed hardness of a metal alloy. Four specimens of the alloy were obtained, and each tip was tested once on each specimen, producing the following data Fill the gap in the table. Give all of your answers to 3 significant figures.Analysis of Variance for Hardness The standard deviation for the normal distribution will be%3D