The Kruskal-Wallis test is a nonparametric test. It is used to test the hypothesis that three or more independent samples come from populations with the same distribution.
Note: This test requires that the sample data are already listed in three or more columns of the STATDISK data window. If the data are not already there, close this window and enter or open data sets so that they are listed in columns of the STATDISK Data Window. (To open a data set from Appendix B in the textbook, click on "Datasets" at the top. To manually enter a data set, click on Data, then click on Sample Editor. The data can also be copied into STATDISK from another application, such as Minitab or Excel.) The sample data must include at least three columns.
Significance (level): Enter a positive value in decimal form, such as 0.05.
Identify the columns to be used by checking (or unchecking) the boxes.
Click on the Evaluate button to obtain the results.
Click on the Print button to print the results.
Click on the Plot button to obtain a graph showing the test statistic and critical value.
To close the window, click on the X at the top of the module window.