Data Visualization using Statistical Graphs

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Data visualization is the graphical representation of information and data. It uses charts, graphs, and maps to make trends, outliers, and patterns easier to understand.

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A graph is a pictorial representation or diagram that presents data or values in an organized manner. The points on a graph often show the relationship between two or more things.

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Graphs have two axes: the X-axis and the Y-axis. The X-axis is horizontal and the Y-axis is vertical. They are perpendicular to each other, and their intersection is called the Origin.

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On the X-axis, values to the right of the origin are positive and values to the left are negative. On the Y-axis, values above the origin are positive and values below the origin are negative.

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A bar graph is a chart that presents categorical data using rectangular bars whose heights or lengths are proportional to the values they represent. Bars can be plotted vertically or horizontally.

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A vertical bar chart is also called a column chart. It is used to compare categories using bars drawn upward from a base line.

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A bar graph is useful when data is categorical and a clear comparison is needed between different groups. The bar length or height shows the value of each category.

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A histogram is a graphical display of data using bars of different heights. It is used for continuous data, where each bar groups numbers into ranges.