apy, The most common therapy for warts is cryother- in which liquid nitrogen is applied to the area of the wart every few weeks, freezing it for a few seconds until the wart falls off. This isn't as painful as it sounds, but requires a physician's attention and, for some patients, is chilling to contemplate. An alternative therapy, presumably based on the theory that it works to fix every- thing else, is to put duct tape on the wart and leave it there for a week at a time until the wart goes away. In a randomized trial, 51 patients with warts were randomly assigned to a cryotherapy treatment or a duct-tape treatment (Focht et al. 2002). Of 26 patients treated with duct tape, 22 had their warts completely cured. With the liquid nitrogen treatment, 15 of 25 patients were cured of their warts. a. Draw a mosaic plot to present these data. b. Calculate an odds ratio for the two therapies. Which technique appears to work best? What attention and, for some patients, is chilling to contemplate. An alternative therapy, presumably based on the theory that it works to fix every- thing else, is to put duct tape on the wart and leave it there for a week at a time until the wart goes away. In a randomized trial, 51 patients with warts were randomly assigned to a cryotherapy treatment or a duct-tape treatment (Focht et al. 2002). Of 26 patients treated with duct tape, 22 had their warts completely cured. With the liquid nitrogen treatment, 15 of 25 patients were cured of their warts. a. Draw a mosaic plot to present these data. b. Calculate an odds ratio for the two therapies. Which technique appears to work best? What is the 95% confidence interval for this odds ratio? Interpret the result. c. Test whether duct tape or cryotherapy is a better treatment for warts and interpret the results.