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 medical treatments​ and, if​ so, whether they had benefited from them. For almost all of the​ treatments, approximately ​% of those responding reported cures or substantial improvement in their condition.
​a) What is the​ population?
A.
Those who do not use medical treatments
B.
Everyone who uses treatments
C.
​Unclear, but probably all adults in the country