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lecture_2_1

# lecture_2_1 - Looking at data relationships Scatterplots...

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Looking at data: relationships   Scatterplots IPS chapter 2.1 © 2006 W. H. Freeman and Company

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Objectives (IPS chapter 2.1) Scatterplots Scatterplots Explanatory and response variables Interpreting scatterplots Outliers
Student Beers Blood Alcohol 1 5 0.1 2 2 0.03 3 9 0.19 4 7 0.095 5 3 0.07 6 3 0.02 7 4 0.07 8 5 0.085 9 8 0.12 10 3 0.04 11 5 0.06 12 5 0.05 13 6 0.1 14 7 0.09 15 1 0.01 16 4 0.05 Here, we have two quantitative variables for each of 16 students. 1) How many beers they drank, and 2) Their blood alcohol level (BAC) We are interested in the relationship between the two variables: How is one affected by changes in the other one?

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Student Beers BAC 1 5 0.1 2 2 0.03 3 9 0.19 4 7 0.095 5 3 0.07 6 3 0.02 7 4 0.07 8 5 0.085 9 8 0.12 10 3 0.04 11 5 0.06 12 5 0.05 13 6 0.1 14 7 0.09 15 1 0.01 16 4 0.05 Scatterplots In a scatterplot, one axis is used to represent each of the variables, and the data are plotted as points on the graph.
Explanatory (independent) variable: number of beers Response (dependent) variable: blood alcohol content x y Explanatory and response variables A

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