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The experiment examined the effects that witness age (6, 10, or 22 year old), witness speech style (powerful or powerless), and prosecuting attorney's questioning style (open-or closed-ended) have on perceived witness credibility and trial outcome. Potential jurors (N=276) read trial transcripts involving a murder. A significant age by speech style interaction revealed that speaking in a powerless manner was significantly more harmful to the adult witness' credibility than it was to the child witness' credibility. A Significant Age × Question Form interaction revealed that question form only had a significant effect on the 6-year-old's credibility. Finally, verdicts, guilt ratings, and the length of the sentence were significantly correlated with ratings of the witness' credibility.