In each case, answer the following questions. a) is it an experimental or an observational study? b) if it is an experimental study, what is the control group and the treatment group? Case 1: People are asked if they have had magnetic therapy and whether their pain is reduced. [3-K] Case 2: As part of a study to gain information regarding travel to Mars, NASA is paying subjects $18 000 to lie in bed for 70 days. [3–K] students while the other has right-handed students. Their math grades are collected and analyzed. [3-K] Case 3: Two randomly selected groups of 100 students are studied. One group has all left-handed

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