For the research scenarios in parts (a) and (b), explain whether a randomized experiment could be used.
a. To study the relationship between long-term practice of meditation and blood pressure.
b. To determine whether a special training program improves scores on a standard college admissions test.
c. For each of parts (a) and (b) of this exercise, state the explanatory variable and the response variable.
d. For each of 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.