. Author manuscript; available in PMC: 2010 Apr 28.

Published in final edited form as: Law Hum Behav. 2008 Jun 28;33(3):247–257. doi: 10.1007/s10979-008-9133-0

Table 2.

Means and univariate effects of internal validity on expert evidence quality, expert credibility, and plaintiff credibility

Dependent measure	Means (SD)				Univariate effect of internal validity
	Valid	No control	Confound	Experimenter bias	F	df	p	η ²
Expert evidence quality	4.55 (1.07)^a	3.86 (1.11)^a	4.29 (0.90)	4.13 (1.19)	4.01	3, 239	0.02	0.07
Expert credibility	5.52 (0.92)^b	5.01 (1.04)^b	5.37 (0.99)	5.17 (0.96)	2.95	3, 239	0.05	0.06
Plaintiff credibility	3.89 (0.89)	3.79 (0.98)	3.74 (0.98)	3.88 (1.07)	0.38	3, 239	0.50	0.03

Notes: Differences between means sharing the same superscript within each row were statistically significant at p ≤ .05

Expert evidence quality, expert credibility, plaintiff credibility were all composite variables

η² = partial η²