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Question: Environmental Voting of Democrats and Republicans in the U.S. Senate. Display shows the first five rows of a data set with pro- and anti-environment votes (according to the League of Conservation Voters; see Exercise 26) during 2005, 2006, and 2007, cast by U.S. senators. Evaluate the evidence supporting party differences in the percentage of pro-environment votes. Write a brief report of your conclusion, and include a graphical display and summary statistics.

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