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### 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 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/
```
Associated Topics:
High School Statistics

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