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Table 1 Noticing rates and statistical difference as a function of participant group and driver response

From: Inattentional blindness for a gun during a simulated police vehicle stop

  Officers Trainees Combined Officers–trainees
Compliant 71.1% (27/38) 45.1% (23/51) 56.2% (50/89) 26% Z = 2.44, p = 0.015
Aggressive 62.2% (23/37) 38.8% (19/49) 48.8% (42/86) 23.4% Z = 2.15, p = 0.032
Combined 66.7% (50/75) 42% (42/100) 52.6% (92/175) 24.7% Z = 3.23, p = 0.001
Compliant–aggressive 8.9% (Z = 0.82, p = 0.414) 6.3% (Z = 0.64, p = 0.522) 7.4% (Z = −0.92, p = 0.331)  
  1. Z = (Proportion1 − Proportion 2) / Sqrt([Combined proportion] * [1-Combined proportion] * [1/n1 + 1/n2]). For example, the upper-right Z score = (0.771 − 0.451) / Sqrt([0.562][1 − 0.562][1/38 + 1/51]). The p values are two-tailed