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In a randomized comparative experiment on the effect of calcium in the diet on blood pressure,...

In a randomized comparative experiment on the effect of calcium in the diet on blood pressure, researchers divided 54 healthy white males at random into two groups. One group received calcium while the other received a placebo. At the beginning of the study, the researchers measured many variables on the subjects. The paper reporting they study gives x̅ = 114.9 and s = 9.3 for the seated systolic blood pressure of the 27 members of the placebo group. Give a 95% interval for the mean seated blood pressure under a placebo in the population from which the subjects were recruited.

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