A representative sample of 50 students was asked to rate the importance of studying this unit from 1 to 10 (1= Not important at all and 10= Absolutely essential). After everyone recorded their response rating, they were shown a 10-minute video that demonstrated the importance of skills and knowledge acquired through this unit that will be essential as informed health professionals in understanding and evaluating published evidence. This video also highlighted how studying Statistics was going to help them survive the follow on units and their assignments. After the video, students were given the option to change their previous rating. Surprisingly, every one took up the offer and provided a new and higher rating. Which test will be a suitable choice if we want to investigate whether the ratings changed significantly after watching the video? A Wilcoxon Signed Rank test Mann-Whitney U test B C Kruskal-Wallis ANOVA D Spearman's rho E Chi Squared test