33. el Fiky et al. (A-33) measured shunt fraction invasively using a pulmonary artery catheter in 22

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33. el Fiky et al. (A-33) measured shunt fraction invasively using a pulmonary artery catheter in 22 patients undergoing elective coronary artery surgery. From the results, the investigators computed a mean of 19.6 and constructed a 90 percent confidence interval for the population mean with endpoints of 18.8 and 20.4. Which would be the appropriate reliability factor for the interval, z or t? Justify your choice. What is the precision of the estimate? The margin of error?

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