The Scatter Diagrams
This program will show you six scatter diagrams and allow you to change the data. This is outside of the Bursary prescription but does show you how the lines of best fit look on the scatter diagrams, give you the equation and may be useful if you do a project. You can also enter your own data and the Applet will calculate the lines of best fit and equation for you. Remember the nearer the value of r is to 1 or -1, the better the fit of data to the regression line.Instructions
This
program is called an applet. You must have a javascript-enabled browser
with javascript turned on to use these pages - most modern browsers will
allow this.
A "Begin"
button will appear above when the applet is finished loading.
This may take a minute or two depending on the speed of your internet
connection and computer. Please be patient.
Press the "Begin" button to start the applet in another window.
The window opens and displays four scatter diagram of the data set "Body/brain"
weight.
You can transform the X and Y axes by clicking on the appropriate radio
button.
You can select a different dataset from the pop-up menu.
Entering
your own data
To enter or paste in your own data, choose "Enter data"
from the pop-up menu. To enter data either:
Enter the first number, press the TAB key and enter the second number, then press RETURN and continue with another pair of values.
OR
Type the data into two columns of a spreadsheet and then copy it before pasting the data into the window. Your data will then be displayed in the scatter diagram window
The Displayed Sets of Data
Body/brain
weight
X: Body weight of animals
Y: Brain weight
Strength
X: A measure of grip strength.
Y: A measure of arm strength
SAT
Tests
X: Verbal SAT
Y: Quantitative SAT
Mold
X: hours
Y: Colony size
Data are
from Introduction to the Practice of Statistics by David S. Moore
and George P. McCabe.
Dell
internet sales
X: Year(97.2 means February, 1997)
Y: Dollars sold over the internet (in millions) by Dell Computer
