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 Which of the following can you say is an improvement that occurred with the change from multiple waiting lines to a single line? The amount of time patients spent waiting decreased so patients were happier. The amount of patients that visited decreased leading to a decrease in wait times. The variation in wait times decreased. Both the amount of time and the variation decreased making patients happy