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A lesson plan on the difference between correlation and causation. It explains that correlation is a measurement of the relationship between two variables, while causation indicates that one variable produces an effect on another. The document also discusses the importance of identifying the direction and strength of the correlation, and the potential for third variables or random occurrences to influence the relationship. The lesson includes objectives, key concepts, materials needed, and discussion questions.
Typology: Study notes
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Topic
Correlation does not equal causation. Correlation is a measurement of the strength and direction of the relationship between two or more variables. Causation indicates a similar but different relationship between variables, namely that one variable produces an effect on another variable or causes it. Data can be strongly or weakly correlated, which shows the strength of the link between them, as well as the strength of their predictive power. When describing the direction of two variables’ relationship, the terms “positive” and “negative” are used. Positively correlated data means both variables increase or decrease together while negatively correlated data means that one variable increases while the other decreases. Just because data correlates does not mean there’s a causal link between them: the variables could be influenced by a third, unknown variable or just randomly happen to correlate.
Possible subjects/classes Time needed
Science, English, History, Philosophy, Psychology, Sociology, Government 30-45 minutes
Video link:
https://academy4sc.org/topic/correlation-vs-causation-the-missing-link/
Objective: What will students know/be able to do at the end of class?
By the end this lesson, students will be able to... ● Explain the four descriptors for how data correlates ● Identify how correlation can indicate about the relationship between two variables ● Explain the difference between correlation and causation
Key Concepts & Vocabulary
Causation, Correlation, Scatter plot, Strong vs Weak Correlation vs No Correlation, Positive vs Negative Correlation
Materials Needed
Change
Either print outs or a projection screen for scatter plot examples.
Before you watch
Pair and Share: Show students an example of a scatter plot that shows strong negative correlation and another that shows weak positive correlation. Have students group up and ask them to describe the relationship between the two variables for the two examples.
While you watch
After you watch/discussion questions
Activity Ideas
● Find some examples of correlating data (try Spurious Correlations). Have students work either independently or in groups to come up with possible explanations for why the data may correlate. It’s okay if they get stuck - sometimes two unrelated data sets will match up! The purpose is to show students that correlating data doesn’t necessarily indicate that the two variables directly affect each other, or even have anything in common. ● Look for popular articles that mention correlation between two variables. Does the article presume that one variable causes the other because of this correlation? Why? How could the article be changed to better reflect the truth about correlation?
Sources/places to learn more
Aldrich, John. “Correlations Genuine and Spurious in Pearson and Yule.” Statistical Science, vol 10, no 4, 1995, pp 364-376. DOI: 10.1214/ss/1177009870. Allen, John-Mark A, Jonathan Barrett, Dominic C. Horsman, Ciarán M. Lee, and Robert W. Spekkens. “Quantum common causes and quantum causal