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Creating dotplots
This tutorial covers the steps for creating simple dotplots in StatCrunch. To begin, load the Exam Scores data set, which will be used throughout this tutorial. This data set contains only one column of data containing 23 exam grades for an introductory Statistics course.
Creating a dotplot
To create a dotplot of the scores in the Exam 2 column, choose the Graph > Dotplot menu option. Select the Exam 2 column and click Compute!. Each dot in the plot shown below represents one of the exam scores. Scores that are very close together may be stacked one on top of the other in the display for clearer display. By default, StatCrunch produces the dotplot at the default graphics size as determined by the dimensions of the browser window. For smaller data sets such as this one, this can sometimes lead to a great deal of white space above the dots. The size of the dot plot can be adjusted by clicking and dragging the edges of its containing window. Note that if the plot is not large enough to display all of the points individually, then it may be necessary for each dot to represent more than one data value. In such cases, StatCrunch will display the number of data values represented by each point in the title of the dotplot.
Changing the point size
With the Point size option, StatCrunch can also alter the size of the points displayed in the dotplot. For example, in the window containing the resulting dotplot above, choose Options > Edit to reopen the dotplot dialog window. Change the point size from the default of 2 to 5 and click Compute!. The resulting dotplot shown below has much larger dots. Increasing the size of the points in this example leads to more stacking of adjacent points in the plot.

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