Comment by Dylan16807

Okay I misread you then, but you're saying the 2000 Accord sedan only has one weight, while the Civic has a several percent range? If that's right then do we know which Civic trim is equivalent to the Accord?

If we know that trim is worth at least 6%, and we don't know how to align the cars, then the confidence interval around "1% to 7%" extends far enough to overlap some negative percents.