Chapter_04 - Chapter 4 Scatterplots and Correlation BPS -...

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BPS - 5th Ed. Chapter 4 1 Chapter 4 Scatterplots and Correlation
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BPS - 5th Ed. Chapter 4 2 Explanatory and Response Variables Interested in studying the relationship between two variables by measuring both variables on the same individuals. a response variable measures an outcome of a study an explanatory variable explains or influences changes in a response variable sometimes there is no distinction
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BPS - 5th Ed. Chapter 4 3 Question In a study to determine whether surgery or chemotherapy results in higher survival rates for a certain type of cancer, whether or not the patient survived is one variable, and whether they received surgery or chemotherapy is the other. Which is the explanatory variable and which is the response variable?
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BPS - 5th Ed. Chapter 4 4 Graphs the relationship between two quantitative (numerical) variables measured on the same individuals. If a distinction exists, plot the explanatory variable on the horizontal (x) axis and plot the response variable on the vertical (y) axis. Scatterplot
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BPS - 5th Ed. Chapter 4 5 Relationship between mean SAT verbal score and percent of high school grads taking SAT Scatterplot
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BPS - 5th Ed. Chapter 4 6 Scatterplot To add a categorical variable , use a different plot color or symbol for each category Southern states highlighted
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BPS - 5th Ed.
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Chapter_04 - Chapter 4 Scatterplots and Correlation BPS -...

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