I find it much easier to understand data if it can be represented visually, and Excel makes it so easy to produce graphs and pie-charts. Florence Nightingale, "The Lady with the Lamp," the 'self-styled' pioneer of modern nursing is widely creditied with inventing the pie-chart. She was a far better statistician than she was a nurse, and it is probably truer to say she popularised the use of pie-charts as a way of presenting statistical data, rather than inventing them.
Regardless of who invented them, they do make it easier to see compoaritive differences and similarities of some data easily.
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