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How to Create a Scatter Plot

To create a scatter plot for this activity:

1. Draw a graph with an x-axis and a y-axis like the one drawn below.

2. Label the graph with a title such as "Relationship between Glide Slope and Average Speed."

3. Label the x-axis as Glide Slope (degrees) and label the y-axis as Average Speed (inches/second).

4. Determine marks for intervals that will effectively use the amount of space on your paper.

  1. A good distance to use between "marks" is 1 cm.
  2. Each "mark" has an interval that is determined by the highest and lowest values of both the x-axis and y-axis (in this case Glide Slope and Average Speed).
  3. Intervals that are commonly used include: 1s, 2s, 5s, 10s, 20s, 25s, 50s, 100s.
  4. An 8 1/2" x 11" paper can easily fit 15- 1cm "marks" horizontally, and 20-1cm "marks" vertically.

Example
If the values on the x-axis 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 y-axis range from 10 to 60, then intervals of 2s would require 25-1cm 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.

scatter sheet showing relationship between glide slope and average speed

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 (x-axis) and the Average Speed value (y-axis). 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.

blank scatter sheet for student practice

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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