Developing 18: Names and Shoe
Lengths (p 20)
Here is a TI83 scatter plot of the data number of
consonants in a name with shoe lengths, for 25 students.
Note that the window dimensions are [0,7] on the
horizontal scale and [20,35] on the vertical
scale.
The scatter plot displays a nonexistent relationship
between the two data sets. There seems to be no patterns
or direction to the scatter plot. If an ellipse were to
be drawn around the points it would be close to being a
circle.
On the linear correlation scale provided with the
problem on page 20, the third choice, "No Correlation" is
the best choice. Numerically, the correlation between the
two data sets is close to 0.
