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Q: With individual lines at its various windows, a post office finds that the standard deviation for normally distributed waiting times for customers is 7.2 minutes. The post office experiments with a single, main waiting line and finds that for a random sample of 25 customers the waiting times for customers have a standard deviation of 4.5 minutes. At the 5% significance level, determine if the single line changed the variation among the wait times for customers.

Q: With individual lines at its various windows, a post office finds that the standard deviation for normally distributed waiting times for customers is 7.2 minutes. The post office experiments with a single, main waiting line and finds that for a random sample of 25 customers the waiting times for customers have a standard deviation of 4.5 minutes. At the 5% significance level, determine if the single line changed the variation among the wait times for customers.

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Q: With individual lines at its various windows, a post office finds that the standard deviation for normally distributed waiting times for customers is 7.2 minutes. The post office experiments with a single, main waiting line and finds that for a random sample of 25 customers the waiting times for customers have a standard deviation of 4.5 minutes. At the 5% significance level, determine if the single line changed the variation among the wait times for customers.
Transcribed Image Text:Q: With individual lines at its various windows, a post office finds that the standard deviation for normally distributed waiting times for customers is 7.2 minutes. The post office experiments with a single, main waiting line and finds that for a random sample of 25 customers the waiting times for customers have a standard deviation of 4.5 minutes. At the 5% significance level, determine if the single line changed the variation among the wait times for customers.
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