Question: How does a decrease in sample size affect the confidence interval? Recalculate the confidence interval for pulse oximetry in the section titled "Decisions About Means in Two Independent Groups" (pg 136) assuring that the means and standard deviations were the same but only 25 patients were in each group. Recalculate the pooled standard deviation and standard error and repeat the confidence interval. Is the conclusion the same?

Table 6-1

*Arterial blood gases were obtained on 158 patients who were positive for PE and on 640 patients who were negative for PE; otherwise all data were collected on 181 patients who were positive for PE and 753 patients who were negative for PE.

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