To begin the analysis, from the menus choose:

Analyze
Nonparametric Tests
K Independent Samples...

Select Score on training exam as the test variable.

Deselect Kruskal-Wallis H, and select Median as the test type.

Select Sales training group as the grouping variable.

Click Define Range.

Type 1 as the minimum and 3 as the maximum values.

Click Continue.

Click OK in the Tests for Several Independent Samples dialog box.