A new measure of group decision-making efficiency

Cognitive Research: Principles and Implications

Table 3 Mean correct response time (RT) and accuracy for all the combinations of social condition and difficulty level (alpha value) in Experiments 2a and 2b

Experiment 2a	0.81	0.85	0.865	0.885	0.9	Average
RT (seconds)
Worse observer	0.809 (0.097)	0.963 (0.115)	1.049 (0.157)	1.124 (0.159)	1.205 (0.184)	1.030 (0.197)
Better observer	0.753 (0.077)	0.825 (0.081)	0.909 (0.103)	0.978 (0.124)	1.008 (0.159)	0.895 (0.145)
Collaboration	0.782 (0.075)	0.896 (0.089)	0.978 (0.121)	1.054 (0.135)	1.104 (0.165)	0.963 (0.165)
average	0.781 (0.085)	0.895 (0.109)	0.979 (0.138)	1.052 (0.149)	1.106 (0.184)
Accuracy
Worse observer	0.91 (0.06)	0.72 (0.13)	0.61 (0.08)	0.46 (0.13)	0.36 (0.19)	0.61 (0.22)
Better observer	0.96 (0.02)	0.85 (0.07)	0.77 (0.07)	0.61 (0.07)	0.48 (0.08)	0.73 (0.18)
Collaboration	0.99 (0.02)	0.95 (0.06)	0.87 (0.12)	0.72 (0.14)	0.57 (0.12)	0.82 (0.18)
average	0.95 (0.05)	0.84 (0.13)	0.75 (0.14)	0.60 (0.16)	0.47 (0.13)
Experiment 2b	0.69	0.77	0.83	0.87	0.9	average
RT (seconds)
Worse observer	0.900 (0.222)	0.935 (0.193)	1.082 (0.297)	1.170 (0.300)	1.275 (0.463)	1.072 (0.329)
Better observer	0.748 (0.121)	0.836 (0.189)	1.025 (0.259)	1.165 (0.287)	1.271 (0.470)	1.009 (0.341)
Collaboration	0.823 (0.137)	0.880 (0.147)	1.049 (0.269)	1.170 (0.290)	1.296 (0.451)	1.044 (0.324)
average	0.824 (0.172)	0.884 (0.176)	1.052 (0.267)	1.168 (0.282)	1.281 (0.445)
Accuracy
Worse observer	0.89 (0.12)	0.77 (0.16)	0.60 (0.13)	0.48 (0.16)	0.38 (0.18)	0.63 (0.24)
Better observer	0.99 (0.01)	0.97 (0.03)	0.87 (0.11)	0.61 (0.14)	0.37 (0.18)	0.76 (0.27)
Collaboration	0.97 (0.03)	0.92 (0.09)	0.84 (0.12)	0.67 (0.17)	0.45 (0.15)	0.77 (0.22)
average	0.95 (0.08)	0.89 (0.14)	0.77 (0.17)	0.59 (0.17)	0.40 (0.17)