Question: If you have borderline high blood pressure taking magnesium supplements

“If you have borderline high blood pressure, taking magnesium supplements may help Japanese researchers report. Blood pressure fell significantly in subjects who got 400–500 milligrams of magnesium a day for four weeks, but not in those getting a placebo” (USA Weekend, 22–24 May 1998, p. 11).
a. Do you think this was a randomized experiment or an observational study? Explain.
b. Do you think the relationship found in this study is a causal one, in which taking magnesium actually causes blood pressure to be lowered? Explain.

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