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Calcium Supplements

A. (Ey)(Ex2)-(Ex)(Exy) / n(Ex2) - (Ex2)

B. n(Exy) - (Ex)(Ey) / square root of n(Ex2) - (Ex)2

C. r= n(Exy) - (Ex)(Ey) / sq. root of
[n(Ex2) - (Ex)2][n(Ey2) - (Ey)2

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I don't know how come you have those formulae, none is right.
Because this is a test of difference between means:
Using a .05 level of significance, test the hypothesis that there is no difference between the means of the two samples.
Let Md=µ1 - µ2, for this question, the null and alternative hypotheses are:
Ho: µ1 - µ2 = 0, or Md=0
H1: µ1 - µ2 <> 0 or Md<>0
Applying the general formula,

where Md is the difference between sample means, µ1 - µ2 is the difference between ...

Solution Summary

The solution addresses which is the correct formula for the scenario - Sample data were collected in a study of calcium supplements and their effects on blood pressure. One of the following formulas is correct:

A. (Ey)(Ex2)-(Ex)(Exy) / n(Ex2) - (Ex2)

B. n(Exy) - (Ex)(Ey) / square root of n(Ex2) - (Ex)2

C. r= n(Exy) - (Ex)(Ey) / sq. root of
[n(Ex2) - (Ex)2][n(Ey2) - (Ey)2

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