Scatter Plots And Trend Lines Page 2
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4Scatter Plots and Trend Lines
**To determine a correlation, look for a relationship between the data sets!
Positive Correlation
Negative Correlation
No Correlation
As one set of values
As one set of values
The values show no
increases, the other set
increases, the other set
relationship.
tends to increase.
tends to decrease.
**If there is a correlation, draw a trend line that is:
1. … as close to each data point as possible.
2. … has about the same number of points on each side of it.
3. …goes directly through at least two points.
Now that we know how a scatter plot
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is made, and how to determine a
correlation, and how to draw a trend
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line…what does all of this mean?
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