I asked a group of 90 people the same four questions about four different artworks. The group viewed the four artworks in-situ in a gallery setting experiencing the artworks one after the other in the same order. Each of the four questions asked was a Likert item, designed to form a Likert scale. Therefore, I have 90 responses to each of the four Likert scales. It is my understanding that the data is paired or dependent as all responses were generated by the same group of people. And, that this therefore means that I am unable to use the Kruskall-Wallis non-parametric data test which would normally be used to assess ordinal data for more than one group. My hypothesis is that one of the four artworks is more impactful than the others and I therefore want to compare the data from the four scales. Can anyone offer any advice?