One-sample median test
One-sample median tests compare an observed median to a hypothesized value in a given population
For instance, let's say researchers believe that the college-age students will rate the look of a new social networking site at as a "4" on a 5-point Likert scale. Researchers collect a representative sample from a Psychology 101 class and find a median value of "1." This difference of ratings between what researchers expected (Median = 4) and the observed value (Median = 1) may be statistically significant according to a one-sample median test.
The most important part of the one-sample median test is to state the hypothesis for the expected median value in an a priori fashion.
The steps for conducting a one-sample median test in SPSS
2. Click Analyze.
3. Drag the cursor over the Nonparametric Tests drop-down menu.
4. Click One Sample.
5. Click on the Settings tab.
6. Under the Customize tests marker, click on the Compare median to hypothesized (Wilcoxon Signed-rank test) box to select it.
7. In the Hypothesized median: box, type in the a priori hypothesized median value.
8. Click on the Run button.
The steps for interpreting the SPSS output for one-sample median test
If the p-value is LESS THAN .05, then the observed median was significantly different than the hypothesized median.
If the p-value is MORE THAN .05, then the observed median was NOT significantly different than the hypothesized median.
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