English Composition 101: Argumentation - Evidence Types Facts Statistics Testimony Expert Eyewitness Anecdotes Case Studies Logical Reasoning Inductive Deductive

Study Guide: Evidence Types

What It Is

Evidence types are the building blocks of academic and professional writing. They are the facts, data, and expert opinions that support a writer's claim or argument. For example, in an essay arguing that climate change is real, a writer might use statistics to show the rising global temperatures, testimony from a climate scientist to explain the causes, and anecdotes from affected communities to illustrate the consequences. Effective use of evidence types is crucial for convincing readers and establishing credibility.

Core Principles

• Facts: Verifiable information that can be confirmed through evidence.
  • Definition: A fact is a statement that can be proven true or false.
  • Example: "The Earth orbits the Sun" is a fact.
• Statistics: Quantifiable data that supports a claim.
  • Definition: Statistics are numerical values that represent a population or sample.
  • Example: "According to the CDC, 1 in 5 adults in the US has a mental illness" is a statistic.
• Testimony: Expert or eyewitness accounts that provide insight or evidence.
  • Definition: Testimony is a statement from someone with expertise or firsthand experience.
  • Example: "Dr. Smith, a leading climate scientist, states that human activities are the primary cause of climate change" is testimony.
• Anecdotes: Personal stories or examples that illustrate a point.
  • Definition: An anecdote is a brief, relatable story that supports a claim.
  • Example: "I remember the devastating hurricane that hit my hometown last year, which highlights the need for climate action" is an anecdote.
• Case Studies: In-depth examinations of a specific situation or event.
  • Definition: A case study is a detailed analysis of a particular instance or example.
  • Example: "The BP oil spill in 2010 is a case study of the devastating consequences of environmental negligence" is a case study.
• Logical Reasoning: The process of drawing conclusions based on evidence.
  • Definition: Logical reasoning involves using evidence to support a claim or argument.
  • Example: "If climate change is real, then we should take action to reduce our carbon footprint" is an example of logical reasoning.
• Inductive Reasoning: Drawing a general conclusion from specific instances.
  • Definition: Inductive reasoning involves making a generalization based on specific examples.
  • Example: "Many people have experienced the effects of climate change, so it is likely that climate change is real" is an example of inductive reasoning.
• Deductive Reasoning: Drawing a specific conclusion from a general principle.
  • Definition: Deductive reasoning involves applying a general principle to a specific situation.
  • Example: "If all humans are mortal, and Socrates is human, then Socrates is mortal" is an example of deductive reasoning.
• Citation Rules: Properly crediting sources in academic writing.
  • Definition: Citation rules vary depending on the citation style (e.g., MLA, APA).
  • Example: In MLA, a citation for a book would include the author's last name, first name, title, publisher, and publication date (e.g., Smith, John. The History of Climate Change. New York: Random House, 2020).

Common Writing Errors

• Error: "The Earth is round because it looks round."
  • Why it fails: This statement is based on appearance rather than evidence.
  • Correction: "The Earth is round because scientific measurements and observations confirm its spherical shape."
• Error: "Many people believe that climate change is real."
  • Why it fails: This statement relies on opinion rather than evidence.
  • Correction: "According to a recent survey, 70% of Americans believe that climate change is real, and scientific evidence supports this claim."
• Error: "I think climate change is real because I saw a documentary about it."
  • Why it fails: This statement relies on personal experience rather than evidence.
  • Correction: "A recent study published in the Journal of Climate Science found that human activities are the primary cause of climate change, which is supported by numerous other scientific studies."

Quick Application

• Scenario 1: You are arguing that college tuition should be free. Write a thesis statement.
  • Model answer: "While some argue that free college tuition is unaffordable, I believe that it is a necessary investment in the future of our country, as it would increase economic mobility and reduce student debt."
  • Explanation: This thesis statement takes a clear stance on the issue, provides a roadmap for the argument, and sets up the writer's claim.
• Scenario 2: You are writing an essay about the impact of social media on mental health. Use a statistic to support your claim.
  • Model answer: "According to a recent study, 60% of teenagers experience anxiety or depression due to social media use, highlighting the need for responsible social media practices."
  • Explanation: This statistic provides concrete evidence to support the writer's claim and helps to build credibility.
• Scenario 3: You are writing a case study about a successful business. Use logical reasoning to draw a conclusion.
  • Model answer: "If a company like Amazon can achieve success through innovation and customer service, then other businesses can also achieve success by prioritizing these values."
  • Explanation: This logical reasoning uses the example of Amazon to support a broader conclusion and helps to build a persuasive argument.

Last-Minute Revision

• Comma Splices: Avoid using commas to join two independent clauses.
  • Example: "I went to the store, and I bought milk" is a comma splice.
• Subject-Verb Agreement: Ensure that the subject and verb agree in number (singular or plural).
  • Example: "The team are going to the championship" is incorrect because "team" is a singular subject.
• Citation Style: Consistently use a single citation style throughout the paper.
  • Example: In MLA, use the author-date format for citations (e.g., Smith 2020).
• Transitions: Use transitional words and phrases to connect ideas between paragraphs.
  • Example: "However," "in addition," and "nevertheless" are common transitional words.
• Punctuation: Use proper punctuation to separate clauses and phrases.
  • Example: Use a semicolon to separate two independent clauses (e.g., "I went to the store; I bought milk").
• MLA vs. APA: Know the differences between MLA and APA citation styles.
  • Example: In MLA, use the author-page format for citations (e.g., Smith 23), while in APA, use the author-date format (e.g., Smith, 2020).