## Applied Mathematics## Statistics |

## How is statistical data presented? |

There are many ways to present statistical data, all of which involve graphical means to translate the results of statistical tests. A *histogram* is a graphical representation of a distribution function using rectangles. It is also most often constructed from a frequency table (see below). The widths of the rectangles usually indicate the intervals into which the range of observed values are divided; the heights of the rectangles indicate the number of observations that occur in each interval. The shapes of histograms vary depending on the chosen size of the intervals.

*Bar graphs* are similar to histograms, but with the columns separated by each other by small distances. They are commonly used for qualitative variables. A *pie chart* is another way to represent data graphically. In this case, it is a circle divided into segments, or “pie” wedges. Each segment represents not only a certain category, but its proportion to the total set of data. Another type of graph is the *line graph,* which is similar to those seen in geometry: a representation of the data from connected point to connected point. They are one of the most common graphs seen for simple statistical data collection.