9.1 – Flu Vaccination Clinic Wait Times. CVS Minute Health Clinic once had a sep
ID: 3181278 • Letter: 9
Question
9.1 – Flu Vaccination Clinic Wait Times. CVS Minute Health Clinic once had a separate patient waiting line at each nurse practitioner station, but it now has a single waiting line that feeds the nurse practitioner stations as vacancies occur. The standard deviation of customer waiting times with the old multiple-line configuration was 1.8 minutes. Listed below is a simple random sample of waiting times (in minutes) with the single waiting line. The 10 simple values have a standard deviation of 0.5 minutes. 6.5 6.6 6.7 6.8 7.1 7.3 7.4 7.7 7.7 7.7
a) When CVS changed from multiple waiting lines to a single line, how was the mean waiting time affected?
b) When CVS changed from multiple waiting lines to a single line, how was the variation among waiting times affected?
c) What improvement occurred with the change from multiple waiting lines to a single line?
d) What procedure can be used to determine that the single waiting line is better?
Explanation / Answer
1) Mean waiting time decreased due to better utilization of nurse stations
2) Variation also reduced due to pooling of resources. Variation is inversely proportional to sample size. Hence, variation reduced.
3) There is now better utilization of nurse stations and people have to wait lesser and there is greater accuracy of prediction.
4) Calculate the mean and standard deviaition between earlier and now.
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