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Scatter Graphs
Line graphs with no lines that show the correlation between two sets of data.
Line of Best Fit
A straight line that’s only goal is to cross as many points on the scatter graph as possible, while ignoring outliers. This means it doesn’t have to start at 0.
They can then be used just like line graphs for estimation.
Positive correlation
As one value increases, so does the other
Negative correlation
As one value increases, the other decreases
No correlation
No pattern between the 2 sets of data
Why it would not be sensible to estimate x response
x is not on the graph, so the trend may change.
Interpolation
Estimating within the given range
Extrapolation
Estimating outside the given range
Strong correlation
Where points are close to the line of best fit
Weak correlation
Where points are further away to the line of best fit
Correlation clause
Correlation does not always mean a link between both sets of data.
Note 
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