Florence Nightingale is best known for her sterling work, as a nurse, improving the health conditions of British soldiers in the Crimea by improving hygiene for example. her contributions to statistics are less well known but important. She developed graphical methods for illustrating public health statistics for UK members of parliament- not the brightest of people in general and was able to use observational studies to show the effect of improved hygiene in field hospitals on mortality. She developed a version of the pie chart.
To remind you of what a good pie chart looks like I have given an example (h/t the Laughing Squid)
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