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Chapter 3 Displaying and Describing Categorical Data

Chapter 3 Displaying and Describing Categorical Data. *Independence *Contingency Tables *What can go wrong?. Independence. In a contingency table, when the distribution of one variable is the same for all categories of another, the variables are INDEPENDENT Just Checking pg 28.

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Chapter 3 Displaying and Describing Categorical Data

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  1. Chapter 3 Displaying and Describing Categorical Data *Independence *Contingency Tables *What can go wrong?

  2. Independence • In a contingency table, when the distribution of one variable is the same for all categories of another, the variables are INDEPENDENT • Just Checking pg 28

  3. Examining Contingency Tables • Medical researchers followed 6272 Swedish men for 30 years to see if there was any association between the amount of fish in their diet and prostate cancer. Prostate Cancer Fish Consumption

  4. Process • Think • State the problem • Identify the variables and the W’s • Check any conditions • Show • Mechanics (crunch numbers and make displays) • Tell • Conclusion – interpret the patterns in the table and displays in context. Discuss possible real-world consequences. Be careful not to overstate what you see.

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