# Lecture 4 - STT 421 Lecture 4 Material Covered in This...

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STT 421 Lecture 4 Material Covered in This Lecture: * Chapter 2, Section 2.1: Scatter plots. * Chapter 2, Section 2.2: Correlation. Introduction Association between variables (Statistical relation): Response variable, explanatory variable: . Scatter plots: A scatter plot shows the relationship between two quantitative variables measured on the same individuals.

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appear on the horizontal axis, and the values of the other variable appear on the vertical axis. Each individual in the data appears as the point in the plot fixed by the values of both variables for that individual. Remark: Always plot the explanatory variable, if there is one, on the x- axis of a scatter plot, and response variable on the y-axis. Example: Suppose X, and Y are two quantitative variables. Each column in the following table represents the values of X and Y from one individual. Draw the scatter plot.
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## This note was uploaded on 07/25/2008 for the course STT 421 taught by Professor Nane during the Summer '08 term at Michigan State University.

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Lecture 4 - STT 421 Lecture 4 Material Covered in This...

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