16. Reconsider the axial stiffness data given in Exercise 8.

ANOVA output from MINITAB follows:

Analysis of Variance for stiffness Source DF SS MS F P length 4 43993 10998 10.48 0.000 Error 30 31475 1049 Total 34 75468 Level N Mean StDev 4 7 333.21 36.59 6 7 368.06 28.57 8 7 375.13 20.83 10 7 407.36 44.51 12 7 437.17 26.00 Pooled StDev
32.39 Tukey’s pairwise comparisons Family error rate
0.0500 Individual error rate
0.00693