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Bivariate Data

Author: Daniel Nelson

Definitions

Bivariate: fancy word for 2 variables. Chances are, you've already worked with bivariate equations in algebra when you have equations like y=2x. X and Y are your 2 variables

Contingency Table: Records the data of 2 or more categorical values. Examples below to make it easier

Relative Frequency: the frequency (how often an outcome occurs) in relation to the total number of outcomes. For example, if you pull 3 red marbles out of a bag of 10 total, then the relative frequency is 3/10

Scatter plot: much like a dot plot, except it's 2-D, so you use the x- and y-axis. Much like plotting a line in algebra, except you don't connect the points and they don't necessarily have to be in a straight line. Oftentimes, they aren't straight. More examples below

Bivariate Data Explanation

Scatterplot and Contingency Table Practice

Try your hand at making a scatterplot and table with the data provided. Answer on second and fourth pages. Graph created on http://www.mathcracker.com/scatter_plot.php which is why the x-axis starts at 4 instead of 0.

More Scatter Plot Help

Visit this site for more looks at scatter plots: http://www.purplemath.com/modules/scattreg.htm