The listed values are waiting times (in minutes) of customers at a local Bank of America, where customers enter a single waiting line that feeds 3 tellers. Test the claim that the standard deviation of waiting times is less than 1.9 minutes which is the standard deviations at the bank when separate waiting lines are used for each of the teller windows. Use a signifcance level of 95% (one-tailed). Does the use of a single line appear to reduce the variation among waiting times?