A large hospital wants to estimate the average length of time previous patients who have had surgery have remained in the hospital. The standard deviation of the lengths of stay of all previous surgery patients is known to be 7.4 days. A random sample of 50 surgery patients' records is obtained, and the mean length of time these patients stayed in the hospital was 6.2 days. A. Find a 95% confidence interval for the mean length of time all surgery patients stay in the hospital.

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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Q2/
A large hospital wants to estimate the average length of time previous
patients who have had surgery have remained in the hospital. The
standard deviation of the lengths of stay of all previous surgery
patients is known to be 7.4 days. A random sample of 50 surgery
patients' records is obtained, and the mean length of time these
patients stayed in the hospital was 6.2 days.
A. Find a 95% confidence interval for the mean length of time all
surgery patients stay in the hospital.
Transcribed Image Text:Q2/ A large hospital wants to estimate the average length of time previous patients who have had surgery have remained in the hospital. The standard deviation of the lengths of stay of all previous surgery patients is known to be 7.4 days. A random sample of 50 surgery patients' records is obtained, and the mean length of time these patients stayed in the hospital was 6.2 days. A. Find a 95% confidence interval for the mean length of time all surgery patients stay in the hospital.
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