Research Scenario: In response to recent Gallup and Pew Center polls of Americans' trust in their political leaders (http://www.gallup.com/poll/195716/americans-trust-political-leaders-public-new-lows.aspx; http://www.people-press.org/2014/11/13/public-trust-in-government/), a political psychologist decides to study people's trust in politicians among different political parties and regions in his state. The psychologist administers a scale-level questionnaire with possible scores ranging from 1-50, with higher scores indicating higher trust in politicians, and lower scores indicating lower trust. The data from this scale-level questionnaire are shown in the table below. Is there a difference in mean trust scores between the different groups?

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