An article in Obesity Research “Impaired pressure natriuresis in obese youths,”

Question

An article in Obesity Research “Impaired pressure natriuresis in obese youths,” (2003, Vol. 11, pp. 745–751) described a study in which all meals were provided for 14 lean boys for three days followed by one stress test (with a video-game task). The average systolic blood pressure (SBP) during the test was 118.3 mm HG with a standard deviation of 9.9 mm HG. Construct a 90% one-sided upper confidence interval for mean SBP. Assume population is approximately normally distributed.

Round your answer to 3 decimal places.

Explanation / Answer

Mean is 118.3, n=14 and s is 9.9. standard error se=9.9/sqrt(14)=2.65

for 90% confidence, the z value can be found from normal distribution table as 1.28

Thus answer is mean+z*se = 118.3+1.28*2.65 =121.692

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