16.To investigate the relationship between intracellular calcium and blood pressure, re-searchers measured the free calcium concentration in the blood platelets of 38 peoplewith normal blood pressure and 38 people with high blood pressure. Suppose we wantedto construct a 99% confidence interval for the difference of the means for the two groups.Which of the following formulas should be used?qˆp1(1-ˆp1)n1+ˆp2(1-ˆp2)n2qs21n1+s22n2qs21n1+s22n2
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