A self-proclaimed health and wellness company contracted statisticians to examine the efficacy of their newly developed dieting program. They provided the statisticians with data from a publicized weight loss competition that they hosted to advertise the release of their new product. For the competition, participants completed the dieting program and were ranked in order of the amount of weight they lost pre- and post-completion of the program. What statistical analysis could the statisticians perform to assess the efficacy of the dieting program?