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How to Create a Scatter Plot
To create a scatter plot for this activity:
1. Draw a graph with an xaxis and a yaxis like the one drawn below.
2. Label the graph with a title such as "Relationship between Glide
Slope and Average Speed."
3. Label the xaxis as Glide Slope (degrees) and label the yaxis as
Average Speed (inches/second).
4. Determine marks for intervals that will effectively use the amount
of space on your paper.
 A good distance to use between "marks" is 1 cm.
 Each "mark" has an interval that is determined by the highest and
lowest values of both the xaxis and yaxis (in this case Glide Slope
and Average Speed).
 Intervals that are commonly used include: 1s, 2s, 5s, 10s, 20s, 25s,
50s, 100s.
 An 8 1/2" x 11" paper can easily fit 15 1cm "marks" horizontally,
and 201cm "marks" vertically.
Example
If the values on the xaxis range from 20 to 50, then intervals of 2s
would require 15 intervals. This means that I can fit all the values from
20 to 50 by counting by 2s, and by making "marks" 1cm apart.
If the values on the yaxis range from 10 to 60, then intervals of 2s
would require 251cm intervals. Another option would be to use intervals
of 5s which would require only 10 intervals. In this case, to maximize
the amount of space on the paper, 2cm intervals could be used instead
of 1cm intervals.
Practice
Using a ruler, "mark" off both axes to include the entire range of values
from highest to lowest for both the Glide Slope and the Average Speed.
Plot each point using both the Glide Slope value (xaxis) and the Average
Speed value (yaxis). In other words, you need both the Glide Slope and
Average Speed numbers to make just one point. You should have 10 points
all together.
1.
2. 
Do you notice any type of correlation in the points?
If yes, what type of correlation do you see? __________ 
3. 
Using a ruler, draw a line of best fit.
Using the line of best fit, what would be the average speed for a
glide slope of: 

Glide Slope 
Average Speed 
44 
_______________ 
52 
_______________ 
60 
_______________ 

4. 
Using the line of best fit, what would be the glide slope for an
average speed of: 

Average Speed 
Glide Slope 
40 
_______________ 
60 
_______________ 
110 
_______________ 

Answer Key
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