This type of chart not only highlights trends and relationships ... Above is a combination chart showing a positive relationship between increasing sales (column chart) and rising profit margins ...

Image caption, Once all eight data points have been plotted give the graph an appropriate title, for example 'Maths and Science assessment marks'. For a positive correlation, as one variable ...

The 'line of best fit' is a line that goes roughly through the middle of all the scatter points on a graph. The closer the points are to the line of best fit the stronger the correlation is.