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Overview of the Trendline chart element.

#### Example Excel Spreadsheet

In Excel, trend lines are used
in the scatter plots, and
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they show the general direction that
the points of a scatter plot are going.
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Let's add a trend line to the Height and
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Weight scatter plot we made
earlier in this course.
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So, you've probably guessed correctly that
we're gonna go back to the Design section
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of the ribbon and add a chart element.
0:20

And down here is Trendlines,
lets do Linear.
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The slope of the trendline will signal the
strength of the correlation of the x and
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y variables.
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Let's make our trendline
a little bit thicker.
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I'm gonna click on it, to select it,
then I'm gonna right click it and
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scroll down to Format Trendline.
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And I'm gonna go to the Line section and
increase the Width.
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And to make it stand out a bit more,
I'm gonna make it black,
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because the data points are blue.
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So again, the slope with a trendline will
signal the strength of the correlation of
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the variables.
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If the trendline is sloping
down from left to right,
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that means that is some degree
of negative correlation.
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If it is sloping up from left to right,
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that means there is some degree
of positive correlation.
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So here,
based on this hypothetical data set,
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if someone is 60 inches tall,
we'd expect their weight to be 120 pounds.
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This is all hypothetical obviously, but
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adding a trendline can help your audience
realized what data points are below or
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above what we'd expect
them to be very quickly.
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