Expert Witness Confidence and Juror Personality: Their Impact on Credibility and Persuasion in the Courtroom

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Figure 1.
Manipulated confidence by perceived credibility.
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Figure 2.
Manipulated confidence by perceived credibility subscales.

Table 1

Juror Personality and Expert Witness Credibility Analyses

Dependent Variable	Personality Set (F(5,282) = )	Significant Personality Domains t(282) = )
Confidence	1.28 (p = .27)  (R² change = .02)	None
Likability	1.01 (p = .41)  (R² change = .02)	Extroversion  (2.06, p = .04)
Trustworthiness	2.65 (p = .02)  (R² change = .04)^*	Extroversion  (3.21, p = .001)
Knowledge	1.44 (p = .21)  (R² change = .03)	Extroversion  (2.45, p = .02)
Total credibility	1.85 (p = .10)  (R² change = .03)^†	Extroversion  (2.67, p = .008)
Total credibility w/o confidence	2.05 (p = .07)  (R² change = .04)^†	Extroversion  (3.00, p = .003)

The set of control variables was not significant in all analyses. All effect size values represent the impact of set two (personality variables).
* Significant set.
† Significant trend.