Chapter 14 (1)

# Chapter 14 (1) - Chapter 14 Describing Relationships:...

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Chapter 14 Describing Relationships: Scatterplots and Correlation

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Ave. SAT Score by State What story does the scatter plot tell that the histogram does not?
Outline Scatter plots Interpreting scatter plots Correlation Understanding correlation Warning about correlation

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Scatter plots
Definition A scatter plot displays the relationship between two quantitative variables Explanatory variables go on the x-axis Response variables go on y-axis Must have two measurements for each individual. Examples Age vs. Salary Yield of a crop vs. inches of rain Health vs. wealth

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Health (life expectancy) vs. Wealth (GDP) What is the explanatory variable? What is the response variable? Does wealth “explain” health? How so?
Interpreting Scatter Plots

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Characteristics of any scatter plot Look for overall pattern Form - Linear, S shaped, U shaped, L shaped Direction - Increasing or decreasing Positive association – increasing
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## This note was uploaded on 06/15/2011 for the course STAT 110 taught by Professor Johnson during the Fall '07 term at South Carolina.

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Chapter 14 (1) - Chapter 14 Describing Relationships:...

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