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Bivariate Data

Bivariate Data

Author: Daniel Nelson
Description:

Teach you the basics of bivariate data and some things that accompany it

This packet goes over bivariate data, with different examples and combinations of quantitative and qualitative data, as well as introduces you to contingency tables and scatterplots, with a scatterplot example at the end.

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Tutorial

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