The test for compressive strength has been studied using zinc oxide eugenol cements. The distribution of results is negatively skewed; however, removal of outlying results converts it to a normal one. Test parameters have little effect on results with the exception of the shape of the test cylinder.
References
1.
Grubbs, F.E. : Procedure for Detecting Outlying Observations in Samples, Technometrics11: 1-21, 1969.
