![]() The single points on the diagram show the outliers. The values at which the horizontal lines stop at are the values of the upper and lower values of the data. The right edge of the box shows the upper quartile it shows that $25$% of the data lies to the right of the upper quartile value. The left edge of the box represents the lower quartile it shows the value at which the first $25$% of the data falls up to. This shows that $50$% of the data lies on the left hand side of the median value and $50$% lies on the right hand side. The line splitting the box in two represents the median value. Interpreting a boxplot can be done once you understand what the different lines mean on a box and whisker diagram. Demographers use these simple graphs to evaluate the extent of development for a given population usually an individual nation and to make predictions about the types of services that population. These can be displayed alongside a number line, horizontally or vertically. A population pyramid, or age structure graph, is a simple graph that conveys the complex social narrative of a population through its shape. It is a useful way to compare different sets of data as you can draw more than one boxplot per graph. The shape of the boxplot shows how the data is distributed and it also shows any outliers. Does the y-axis intercept this tilted graph at. yx 2 (well, rotate it, actually) counterclockwise about the origin just 0.01. ever vertical Practice 2: Suppose we tilt the graph of. yx 2 graph After all, the sides of the letter U are vertical. Contents Toggle Main Menu 1 Definition 2 Reading a Box and Whisker Plot 2.1 Video Examples 3 Constructing a Box and Whisker Diagram 4 Worked Example 4.1 Video Example 4.2 Common Mistakes 5 Workbook 6 Test Yourself 7 External Resources DefinitionĪ box and whisker plot or diagram (otherwise known as a boxplot), is a graph summarising a set of data. Is the term U-shaped actually correct for the shape of the. Positive quadratic graphs (where (a textgreater 0)) are U-shaped and have a turning point at the bottom of the curve.
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