STAT 2507 Chapter Notes - Chapter 3: Dependent And Independent Variables, Scatter Plot, Statistical Unit
17 Jan 2015
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When both of the variables are quantitative, call one variable x and the other y. Examples: positive linear negative linear curvilinear no relationship: assume that the two variables x and y exhibit a linear pattern, there are two numerical measures to describe. The strength and direction of the relationship between x and y. The form of the relationship. (cid:122) the correlation coe cient. The strength and direction of the relationship between x and y are measured using the correlation coe cient, r. r = This is the regression line where a = y-intercept of the line. = slope of the line y = a + bx. Example: the number of passes completed and the total number of passing yards were recorded for brett favre for each of the 16 regular season and 2 postseason games in the fall of 2003.
