Microsoft Office Tutorials and References

In Depth Information

Fig. 6.1
Example of a Scatterplot for a Perfect, Positive Correlation (r

¼þ

1.0)

Fig. 6.2
Example of a Scatterplot for a Moderate, Positive Correlation (r

¼þ

.53)

.53
.

This means that each x-value can predict each y-value moderately well because you

can draw a picture of a “football” around the outside of the data points that move

upward-and-to-the-right, but not along a straight line (see Fig.
6.2
).

Fig.
6.3
shows the scatterplot for a low, positive correlation of
r

Fig.
6.2
shows the scatterplot for a moderately positive correlation of
r

¼þ

.23
.This

means that each x-value is a poor predictor of each y-value because the “picture”

you could draw around the outside of the data points approaches a circle in shape

(see Fig.
6.3
)

We have not shown a Figure of a zero correlation because it is easy to imagine

what it looks like as a scatterplot. A zero correlation of
r

¼þ

¼

.00
means that there is

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