Posted: December 8th, 2016

In a randomized comparative experiment on the effect of dietary calcium on blood pressure, researchers divided 54 healthy white males at random into two groups.

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