STATISTICAL ANALYSIS
For success and tester assistance, regression analysis was conducted to
determine the effect of group on task performance. A binary logistic
regression was conducted for the dichotomous variable success and a
multinomial regression analysis was conducted for tester assistance
separately for each experimental task. For hand actions and time to
plan/execute, nonparametric tests (Mann–Whitney U ) were used
because the data was not normally distributed using the Shapiro-Wilk
test of normality (p < 0.05 across comparisons).
Significance was set at p < 0.05 and p -values
between 0.05 and 0.1 were considered as statistical trends.