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Q. Suppose we wish to compare two competing treatments for the management of adult-onset diabetes. A total of eight subjects agree to participate in the investigation and are randomly assigned to one of the competing treatments. After following the prescribed treatment regimen for 6 weeks, we assess the patients’ self-reported health status. Patients are
asked to rate their current health on an ordinal scale from 0 to 20, with higher scores reflecting better health. Are self-reported health status scores different between treatment groups?
Note: The groups are independent, the sample size is small, and it is not stated to be normally distributed, so we use a non-parametric test. As with other non-parametric test, the hypothesis is based on the equality of the medians (μ ̃).