a) A randomized experiment is probably not possible here, since it would be possible to randomly assign some people to two groups, but it would be hard to keep track of compliance. b) A randomized experiment could be done, since it would be possible to randomly assign some people to two groups, and it would be easy to keep track of compliance. (c) For part (a) of this exercise, state the explanatory variable and the response variable. The explanatory variable is blood pressure and the response variable is whether or not a person participated in long-term meditation. The explanatory variable is whether or not a person participated in long-term meditation and the response variable is blood pressure. For part (b) of this exercise, state the explanatory variable and the response variable. The explanatory variable is their score on a standard college admissions test and the response variable is whether or not a person took a special training program. The explanatory variable is whether or not a person took a special training program and the response variable is their score on a standard college admissions test. (d) For both parts (a) and (b) of this exercise, give an explanation of a possible confounding variable that could be present if an observational study were to be done