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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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