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There are a number of ways of representing data diagrammatically.
These are used to compare two sets of data. One set of data is put on the x-axis (the horizontal axis) and the other on the y-axis (the vertical axis). If one set of data depends upon the other, this is put on the y-axis (and is known as the 'dependent variable'). For example, if you were plotting a child's height at various times, the height would depend upon the time and so the height is the dependent variable and goes on the y-axis, whereas time doesn't depend on anything and so is the independent variable and goes on the x-axis.
Usually, we are looking to see if there is a relationship between the two sets of data. We draw a line of best fit. This should ...