Microsoft Office Tutorials and References
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Fig. 6.5 Example of a Scatterplot for a Moderate, Negative Correlation (r
Fig. 6.6 Example of a Scatterplot for a Perfect, Negative Correlation (r ¼ 1.0)
Fig. 6.5 ). In this case, it is a negative correlation because the “football” you could
draw around the data points slopes down and to the right.
Fig. 6.6 shows a perfect negative correlation of r
1.0 which means that X is
a perfect predictor of Y, although in an inverse relationship such that as X increases,
Y decreases. The data points fit perfectly along a downward-sloping straight line
(see Fig. 6.6 )
Let’s explain the formula for computing the correlation r so that you can
understand where the number summarizing the correlation came from.
In order to help you to understand where the correlation number that ranges from
1.0 comes from, we will walk you through the steps involved to use the
formula as if you were using a pocket calculator. This is the one time in this topic
1.0 to
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