Katy had two choices of routes to get her to work. she wanted to choose the route that would get her to work fastest, on average. to determine which route would get her to work faster, on average, she randomly selected 10 days and took route 1 on those 10 days. then she randomly selected a different 10 days and took route 2 on those 10 days. she recorded the time, in minutes, it took her to get from her house to work on each of those 20 days. from her data, she constructed the 95% confidence interval for the difference in mean commuting times (route 1minusroute 2) in minutes as (minus1,9). based on this confidence interval, which of the following is a correct statement?