What is the analyse type that I can run with both independent variable and dependent variable as repeated measure? Urgent thesis submit is very soon

#1
Hello, everyone.

My study is about the product design effect on consumer preference.

In my survey, I presented the respondents with pictures of 2 products (new Vs prototypical) and ask them to rate their relative preference on a 7-point scale.
My measurement question for my dependent variable was:
For category 1, which product would you be more likely to choose?
1= definitely product A, 7= definitely product B

And then asked respondents to rate each product separately on the design newness, prototypicality with:
How do you consider the design of the product?
1=prototypical, 7=new

The design was 2 (product type: new/prototypical) x 3 (product category). Both were a within-subject design.

Q1: What is the proper method in SPSS to analyze the main effect of product design on preference?

Later, I added a mediator to my study, the mediator (Function quality) was measured on a 7 point scale (1= Very low, 7=very high).

Q2: How can I analyze to know the significance of the mediation effect.

Ps. My DV is always a repeated measure.



Thank you in advance for helping me. I'm running out of time and couldn't find the best statistical way for obtaining significant results.