First, there was a significant difference in the variability of judges' responses between items that were incorrectly classified and those that were correct (66% vs. 73%, respectively; two-sample t test: t=2.60, df =73, p<0.02).
as a group the judges were less sure of themselves in those cases in which they incorrectly decided to use or omit the connective, suggesting that either option may have been acceptable.