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The most common therapy for warts is cryotherapy, 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, for some patients, is chilling to contemplate. An alternative therapy, presumably based on the theory that it works to fix everything 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. 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. Researchers suspect that duct tape is a better treatment for removing warts. Test this suspicion and interpret the results. Use a 10% level of significance.
Observed
Cured
Not Cured
Total
Duct tape
22
4
26
Nitrogen
15
10
25
37
14
51
b. Draw a mosaic plot to present these data.
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