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 volunteers 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 a standard deviation of 10 points. The 50 members of the placebo group had blood pressure lowered by an average of 15 points with a standard deviation of 8 points. To analyze this information we will use a a. two-sample t procedure. b. two-sample z procedure. c. matched pairs procedure. A researcher wants to know if calcium is an effective treatment for lowering blood pressure. He assigns one randomly chosen group of volunteers 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 a standard deviation of 10 points. The 50 members of the placebo group had blood pressure lowered by an average of 15 points with a standard deviation of 8 points. To analyze this information we will use a a. two-sample t procedure. b. two-sample z procedure. c. matched pairs procedure.

Explanation / Answer

Answer:

a)      Two sample t procedure

(Because we are not given the information about the population standard deviations and we have to test the significant difference for the two separate groups of persons or participants.)

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