Note: This test requires that paired data are already listed in 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.)
This test is used to test a claim about the mean of the differences between matched pairs of data. The data must be matched or paired. For example, in testing the effectiveness of new diet, obtain sample before and after weights for each subject, then proceed to test the claim that the differences have a mean that is positive.
First select the format of the original claim that is to be tested. Note that there are 6 different choices, which can be viewed by clicking on the small box to the right of the default claim ("Mean of Differences = 0"). Use the up/down arrow keys to highlight the desired choice, then click on that desired choice. STATDISK will determine the appropriate null hypothesis from the claim selected.
Significance (level): Enter a positive value in decimal form, such as 0.05.
Choose the two columns to be used as sample data. The columns must be matched or paired, so they must have the same number of entries.
Click on the Evaluate button to obtain the results.
Click on the Print button to print the results.
Click on the Plot button to display a graph showing the distribution with the test statistic and critical value(s).
To close the window, click on the X at the top of the module window.