Graphing Scatter Plots
Date: 09/26/98 at 19:43:21 From: Alice Subject: Math Graphing (Scatter Plot) How do I make a scatter plot for boys and girls height and shoe size? Also, how can I make a graph online?
Date: 09/26/98 at 20:50:08 From: Doctor Pat Subject: Re: Math Graphing (Scatter Plot) Alice, A scatter plot is simple: make a table for each person, showing height and shoe size in columns marked x and y. Then on a piece of graph paper go over x units to the right of zero, and y units up, and make a point. Do this for the next person's data also. When you have done this for every person, you will get a graph that will show any pattern between height and shoe size. (I would assume that, in general, taller people will have bigger feet, although this will not be a perfect line relation. I may be taller than you and have smaller feet, but we are probably both taller and have bigger feet than a four-year-old). You can find a little more about scatter plots if you look at HyperStat Online, David Lane's introductory level hypertext statistics book: http://davidmlane.com/hyperstat/ This site has a glossary at the top; click on it and then scroll down to the term you want and click to learn more. To draw a scatter plot on-line, you have to be patient and use ascii graphs. Here is what a scatter plot might look like: s | * h | * o | * ** e | * * | * s | *** i | * * z | * * e | * |______________________________________ height where height is the x-value and shoe size is the y-value. Hope this helps. Good luck, - Doctor Pat, The Math Forum http://mathforum.org/dr.math/
Search the Dr. Math Library:
Ask Dr. MathTM
© 1994- The Math Forum at NCTM. All rights reserved.