Kendyl is investigating the efficacy of counseling programs associated with enhanced relationship satisfaction. Kendyl is aware of John Gottman's Weekend Workshops for couples and she is interested in the research question: Is there a statistically significant difference in couples' satisfaction before participating in the workshop and one week after participating in the workshop? 

To measure relationship satisfaction, Kendyl researches a reliable instrument called the "Enrich Marital Satisfaction Scale" (Fowes & Olson, 1993) and gives this scale to couples before participating in the workshop and then again one week after participating.  When analyzing the data, what statistical test should Kendyl use to answer the research question and why?