The data show no apparent trend of increasing absolute difference versus load
level for the base pressure cells, the subgrade pressure cells, or the combined dataset.
Based on visual inspection, there does not appear to be a significant difference between
the average absolute differences at the four load levels for any of the three data sets. To
validate this statistically, a single-factor analysis of variance (ANOVA) (α = 0.05) was
performed to see if there was a statistical difference in the mean absolute pressure
differences when subdivided by load level of any of these three data sets. The p-values
from the load level statistics were 0.543, 0.557, and 0.386 for the base pressure cells,
subgrade pressure cells, and the grouping of all pressure cells, respectively. These
results confirmed that there was no statistical difference between the average
repeatability of pressure cell measurements when they are subdivided based on load
level.