Statistical comparison of methods for group decisions for different group sizes.

The table reports the p-values and corresponding W statistics (in brackets) returned by the one-tailed Wilcoxon signed-rank test when comparing the performance of single observers against the performance of groups of different sizes and adopting different decision methods. Samples sizes (the number of groups of each size) are indicated in the last row of the table. p-values below 0.05 are in italics while values below 0.01 are in bold face. The “Wins” column reports the number of group sizes where p-values were below the 0.05 statistical significance level.