LESSON 9.6: CAUSATION VS. CORRELATION Module 9: Epidemiology Obj. 9.6: Differentiate a causative and correlative relationship between variables.

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Presentation transcript:

LESSON 9.6: CAUSATION VS. CORRELATION Module 9: Epidemiology Obj. 9.6: Differentiate a causative and correlative relationship between variables.

Do Now: #1  1. Causal Factors & Correlated Factors  What causes obesity?  What factors, health behaviors, and/or characteristics might be frequently found among individuals who are obese?

Do Now: #2  2. Words Imply Relationships  Circle the questions that imply a cause and effect relationship between variables. Do diesel fumes from school buses cause asthma? Does eating chocolate give people acne? Are males at higher risk of automobile accidents? Does immunization with the flu shot prevent H1N1? Does acupuncture result in pain relief?

Do Now: #2 3. Be Careful What You Imply  A news reporter reads the results of a study on coffee that state, “Coffee drinkers were three times more likely to report positive mental health than non coffee-drinkers.” The reporter decides to write a news story on this study and titles it, “Drink Coffee for Better Mental Health.” Is this an appropriate title? Why or why not?

“Correlation & Causality”  Watch the Khan Academy video, “Correlation & Causality.” (Run time: 10:44).  gression-correlation/v/correlation-and-causality gression-correlation/v/correlation-and-causality  1. What is wrong with the news article title, “Eating Breakfast May Beat Teen Obesity”?  2. What other factors or behaviors (besides eating breakfast) may also gain attention as ways to protect against obesity, when in fact they may only be correlated with non-obesity?

Five Criteria for Cause-and-Effect Relationships  In general, five criteria must be met to establish a cause-and-effect relationship:  Strength of association—the relationship must be clear.  Consistency—observation of the association must be repeatable in different populations at different times.  Temporality—the cause must precede the effect.  Plausibility—the explanation must make sense biologically.  Biological gradient—there must be a dose-response relationship.  Source: CDC Excite. Epidemiology in the Classroom.

Assess: Causation vs. Correlation

Homework: Find Those Fraudulent Claims!  Find a news article in which the author makes a “correlation does not imply causality” error. Describe the article and the erroneous claim in the box below.