The following data on the fracture load (kN) of Plexiglas at three different loading point locations appeared in the article “Evaluating Fracture Behavior of Brittle Polymeric Materials Using an IASCB Specimen” (J. of Engr. Manuf. 2013: 133–140).

Use a rank-based method to determine whether loading point distance affects true mean fracture load, at the α = .01 level.

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Distance 31.2 mm 36.0 mm 42.0 mm 4.78 3.47 2.62 Fracture load 4.91 3.77 3.39 4.41 3.85 2.99 5.06 3.63 2.86