Better traffic flow the dataset traffic flow gives the delay time in seconds for simulation runs in dresden, germany, comparing the current timed traffic light system on each run to a proposed flexible traffic light system in which lights communicate traffic flow information to neighboring lights. on average, public transportation was delayed seconds under the timed system and seconds under the flexible system. since this is a matched pairs experiment, we are interested in the difference in times between the two methods for each of the simulations. for the differences , we were given that seconds with seconds. we wish to estimate the average time savings for public transportation on this stretch of road if the city of dresden moves to the new system. the standard error is for one set of bootstrap samples. find a confidence interval for the average time savings.