SOLUTION: 200 laboratory sample orders were reviewed and it was determined that the mean turnaround time was 55.6 minutes for reporting the results to the physician. The turnaround times wer

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Question 1086418: 200 laboratory sample orders were reviewed and it was determined that the mean turnaround time was 55.6 minutes for reporting the results to the physician. The turnaround times were normally distributed and showed a sample standard deviation of 5.2 minutes. The researcher s would like to construct a 90% confidence interval.
Calculate the 90% confidence interval:
Present in this format:
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Answer by stanbon(75887) About Me  (Show Source):
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200 laboratory sample orders were reviewed and it was determined that the mean turnaround time was 55.6 minutes for reporting the results to the physician.
The turnaround times were normally distributed and showed a sample standard deviation of 5.2 minutes. The researchers would like to construct a 90% confidence interval.
Sample mean = 55.6 ; Std = 5.2
ME = 1.645*5.2/sqrt(200) = 0.605
Calculate the 90% confidence interval:
5.2-0.605 < u < 5.2+0.605
4.60 < u < 5.81
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Cheers,
Stan H.
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