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Articles

The effect of ambiguous question wording on jurors’ presumption of innocence

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Pages 419-437 | Received 06 Jun 2019, Accepted 20 Aug 2019, Published online: 23 Sep 2019
 

ABSTRACT

Research suggests that jurors misunderstand the presumption of innocence. However, past studies have not asked participants to estimate the defendant’s probability of guilt, setting aside the fact of charge and indictment. We conduct two studies to explore the impact of this question wording on estimates of the probability of guilt/innocence by jury-eligible Mturk workers. In Experiment 1 (N = 275), question wording (legal, factual and ambiguous) was varied within participants and revealed significantly higher estimates of innocence in response to the legal than the factual or ambiguously worded question. In Experiment 2 (N = 303), question wording was manipulated between participants both before (prior) and after (posterior) the presentation of evidence. Prior estimates of guilt were significantly lower in the legal than factual or ambiguous conditions. Question wording also predicted posteriors, and these in turn predicted verdicts. These results suggest that imprecise wording may have contributed to concerns about jurors’ understanding of the presumption of innocence, highlighting the need for further research. Link to associated OSF page: [https://osf.io/ywuxr/?view_only=b2148ffd1f674e62b66d31ed6593e586].

Acknowledgments

Sincere thanks to Agnes Bali for her assistance with data collection, and Bronte Montgomery-Farrer for her contributions to data analysis and manuscript preparation.

Disclosure statement

No potential conflict of interest was reported by the authors.

The data that support the findings of this study are openly available at Open Science Framework [https://osf.io/ywuxr/?view_only=b2148ffd1f674e62b66d31ed6593e586].

Additional information

Funding

This work was supported by Australian Research Council [grant number DE140100183, LP160100008] and Probability and Statistics in Forensic Science, EPSRC [grant number EP/K032208/1].

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