TABLE 1.

Participant responses to a range of questions sub-divided by their initial response to altering the witness’s accuracy.

	Reduce	No change	Increase
Total N	28 (21.4%)	73 (55.7%)	30 (22.9%)
	Cab/witness statistics provided
(Mean) Cab blue estimate	9.5% (0.3%)	16.8% (2.0%)	18.2% (3.6%)
(Mean) Witness accuracy estimate	76.0% (1.9%)	73.3% (2.1%)	71.6% (2.6%)
(Mean) Confidence	67.1% (2.9%)	68.8% (2.7%)	69.9% (3.3%)
	Witness reports cab is blue
(Proportion) Increasing estimate cab blue	67.9% (9.0%)	56.2% (5.8%)	83.3% (6.9%)
(Proportion self-reported assuming):
Witness correct	25.0% (8.3%)	60.3% (5.8%)	80.0% (7.4%)
Cab green	46.4% (9.6%)	15.1% (4.2%)	3.3% (3.3%)
Neither/other	28.6% (8.7%)	24.7% (5.1%)	16.7% (6.9%)
	Told cab actually green
(Proportion) Reducing witness accuracy	78.6% (7.9%)	52.1% (5.9%)	73.3% (8.2%)

In brackets on the left it is indicated whether the figure provides the mean response, or the proportion providing a particular response (in the case of non-continuous outcomes). Questions are in chronological order and the delivery of key pieces of information is indicated. Standard errors for estimates are included in brackets.