Public Speaking

Chapter

8

This ChapTer Will

help You

• Identify types of facts
and learn how to test
factual data

• Select numerical data
carefully

• Use examples
effectively

• Quote authoritative
sources

• Use comparison and
contrast

• Select appropriate
visual evidence

Choosing Supporting Materials

THINK ABOUT a current controversy such as climate change. Why do

intelligent, well-meaning people form such different conclusions that they polar-

ize into opposing camps? Although a majority might believe that weather pat-

terns are changing, people disagree greatly about the causes or effects of these

changes. Some argue that nations and individuals must act quickly to save the

environment or human-created global warming will devastate the planet.^1 They

cite data from seemingly reputable sources such as the National Academy of

Sciences, computer models, and the Intergovernmental Panel on Climate

Change as well as visual images of melting polar ice. In contrast, others,

including scientists and statisticians who’ve studied the issue in depth, agree

Review the

chapter

Learning

Objectives

and Start

with a quick

warm-up

activity.

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