Texas Instruments TINSPIRE Teacher Software Guidebook - Page 618

The box plot is redrawn as a standard box plot with extended whiskers. The standard box plot's whiskers use the minimum and maximum points in the variable and outliers are not identified. The whiskers on the plot extend from the minimum data point in the set (x-min) to the first quartile (Q1) and from the third quartile (Q3) to the maximum point (x-max). The box is defined by Q1, Med (median), and Q3. Note: You can select Show Box Plot Outliers on the Plot Properties menu to return to the modified box plot. When you have a numeric list with a corresponding categorical list, you can create a box plot split by category. Adding the categorical list splits the box plot by category. A split box plot is useful for comparing the spread of various populations. Plotting histograms A histogram plots one-variable data and depicts the distribution of data. The number of bins displayed depends on the number of data points and the distribution of these points. A value that occurs on the edge of a bin is counted in the bin to the right. Creating a histogram 1. Select the data that you want to plot as a histogram. - For horizontal orientation, choose Add X Variable. - For vertical orientation, choose Add Y Variable. 2. From the Plot Types menu, select the Histogram tool. In this example, the data from the box plot separates into points and moves to form the bins of a histogram. The histogram plots on the Data & Statistics work area. 606 Using Data & Statistics