I am designing a questionnaire to compare user experience of usage of a two prototypes of a software - prototype A and B. Users will rate prototype A for a task and then prototype B for performing the same task based on a 5 point Likert scale. The questionnaire will contain 5 questions related to the various measures of user experience and contain ratings for each measure. How can i compare the Likert ratings for the two prototypes using statistical tests?
Just to summarize the comments into an answer.
For comparing ordinal variables like Likert's scale, you may consider using median to represent the central tendency, and inter-quartile range to show the dispersion.
If you would like to test if the medians are equal, sign test is another option, as suggested by ttnphns in the comment.