The scripted vs. unscripted speech debate and the role of statistical power

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Abstract
This paper examines the scripted vs. unscripted speech debate from the perspective of statistical power. Using a case study on Greek pitch accents and simulation-based power analysis, we find that unscripted speech offers greater power for main effects, while scripted speech is more powerful for interactions. The optimal strategy for increasing power — adding speakers vs. adding items — varies depending on the effect being tested. We argue that neither method is inherently superior; the choice should be guided by the research question, the effect size, the results of the power analysis and available resources.