Mean and Median - Communicating Data with Tableau - page 108

Figure 6-7. Add Reference Line dialog boxes
The dialog box on the left results in the shaded region known as the “interquartile range” for
each of the eight positions. The dialog box in the middle creates the eight horizontal lines at
the top of each box plot (maximum), and the dialog box on the right creates the lines at the
bottom (minimum). The resulting box plot is shown in Figure 6-8 .
To add the dots for the mean, click RBI in the Measures panel with the right mouse button
and drag it onto the Rows shelf to the right of the existing SUM(RBI) . Select AVG(RBI) in the
menu that appears when you release the right mouse button.
A second chart now appears below the box plot, and also notice that the Marks area changes
to have three sections: the top section for All , or both; the middle section for SUM(RBI) ; and
the bottom section for AVG(RBI) . Click in the AVG(RBI) section, change the Marks type to
Circle , and drag the Player field out of the Marks card. The view on the bottom changes to a
dot plot of means.