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For the following report, identify (a) the population; (b) the population parameter of interest; (c) the sampling frame; (d) the sample; (e) the sampling method, including whether or not randomization was employed; and (f) any potential sources of bias you can detect and any problems you see in generalizing to the population of interest.
A US consumer magazine asked all adult subscribers whether they had used herbal A medical treatments and, if so, whether they had benefited from them. For almost all of the treatments, approximately 18% of those responding reported cures or substantial improvement in their condition.