A researcher wants to know if calcium is an effective treatment for lowering blo

Question

A researcher wants to know if calcium is an effective treatment for lowering blood pressure. He assigns one randomly chosen group of subjects to take calcium supplements; the other group will get placebo. At the end of the treatment period, he measures the difference in blood pressure. The 50 members of the calcium group had blood pressure lowered by an average of 25 points with standard deviation 10 points. The 50 members of the placebo group had blood pressure lowered by an average of 15 points with standard deviation 8 points. To analyze this information we will use a Answer a. two-sample t procedure. b. two-sample z procedure. c. matched pairs procedure.

Explanation / Answer

c. matched pairs procedure.

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