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Bar charts have a discrete range. Bar charts are usually scaled so that all the data can fit on the chart. Bars on the chart may be arranged in any order. Bar charts arranged from highest to lowest incidence are called Pareto charts. Normally, bars showing frequency will be arranged in chronological (time) sequence.
Bar graphs/charts provide a visual presentation of categorical data. Categorical data is a grouping of data into discrete groups, such as months of the year, age group, shoe sizes, and animals. These categories are usually qualitative. In a column bar chart, the categories appear along the horizontal axis; the height of the bar corresponds to the value of each category.
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The relationship of Education and the population show the volume of the medal data 1994-2014
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Scatterplot faceted
Scatterplot faceted by the countries and Medal
Pie charts are popular as they are easy to create and understand but they are only effective when you’re comparing 3-5 different data points with different quantities that are easy to differentiate.