This procedure can be used when the:

Outcome (Dependent) variable is a Continuous and skewed / Ordinal measure
Exposure (Independent) variable is 1 group

Present this graphically using a Histogram, Box and Whisker, or Dot Plot

In SPSS select: Graphs > Chart Builder - Gallery – Histogram | Simple Histogram, Boxplot | Simple Boxplot, Scatter/Dot | Simple Dot Plot or Bar Chart

To create the dot plot, click the Element properties button and select Plot Shape Symmetric. In the Basic Elements tab Check the Transpose button. Use the Chart Editor to add a reference line to the X axis by Setting the Reference Line to Median.

Analyse this in SPSS using:

Analyze >NonParametric Tests > Legacy Dialogs >Two-Related-Samples Test
     Use the Exact button and select Exact

The Exact Sig. is the p-value.

The Expected Values for an ordinal variable could be that there are equal numbers in each category or you enter values for the expected number in order for each category.

Report this quoting the:

the Median Value, 95% Confidence Intervals for continuous data. Quote a p-value if testing difference from a specified value.
Use Confidence Interval Analysis (CIA)Medians and their Differences | Single Sample to calculate these values

Comments

With a limited number of ordinal categories a Bar Chart may be more appropriate.

Please Report any issues to Brian Yuen