An article stated that last year 807 people taking a certain medication suffered from serious side effects while this year, after medication had been modified, only 391 suffered serious side effects. What information is missing? Why would it be important to include this information?

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Bar Graphs

A bar graph is a chart or graphical representation of data. A bar chart, also known as a bar graph, is a graph or chart that displays categorical data using rectangular bars with heights or lengths equal to the values they represent. Typically, bar graphs show categorical and numerical variables grouped in class intervals. A bar graph is useful for comparing and analyzing a set of data.