Suzy's choice to use solely statistical data from the Congressional Budget Office indicates:

Suzy's decision to rely exclusively on statistical data from the Congressional Budget Office highlights an important aspect of conducting research for public speaking, specifically the risk of over-relying on one type of source. By depending solely on statistical data, she may not be presenting a well-rounded argument, as statistics alone can lack the context or qualitative insights necessary to fully support her case.

A diverse range of sources, including anecdotes, expert opinions, and theoretical frameworks, is essential to enhance the credibility and emotional appeal of a speech. This approach not only provides a more nuanced understanding of the topic but also helps to connect with the audience in various ways, making the argument more compelling overall. The use of only one type of source, while it can provide strong evidence, limits the effectiveness and depth of Suzy's speech.