Removing Workstation-Size interaction results in a model with all significant parameters. Table
2 contains coefficients, standard errors, t Statistics and p-values for the
three-factor ANOVA model fit using multiple regression. The analysis
uses indicator (0,1) variables to represent the factors with the following
baseline categories (factor levels without indicator variables): Sit for
Workstation, Close for Distance and Large for Size. The regression
model has an R-squared of 80.42%. The Intercept of 9.23 represents the
average time for a subject at the traditional workstation (Sit) with Large
targets Close together (index of difficulty of 2). When the subjects
used the standing workstation (Stand), they had an average time 1.16
seconds higher than the traditional workstation and when they used
the treadmill workstation (Walk) the subjects had an average time 2.31
seconds higher than sitting. Therefore, subjects had the lowest times
(highest productivity) when using the traditional workstation with
both standing and walking degrading performance.