To investigate the relationship between intracellular

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16. To investigate the relationship between intracellular calcium and blood pressure, re- searchers measured the free calcium concentration in the blood platelets of 38 people with normal blood pressure and 38 people with high blood pressure. Suppose we wanted to construct a 99% confidence interval for the difference of the means for the two groups. Which of the following formulas should be used? q ˆ p 1 (1 - ˆ p 1 ) n 1 + ˆ p 2 (1 - ˆ p 2 ) n 2 q s 2 1 n 1 + s 2 2 n 2 q s 2 1 n 1 + s 2 2 n 2
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