[DonRotolo]

Yes, let's.

Joe, I think you're spot on. In the big picture, the small error is not significant (due to the topic: No lives depend on it being right).

But this is a good lesson for everyone out there, particularly the engineering types: Don't believe everything Excel (or Mathcad or...) tells you, and if it is important, look at the results skeptically, as Dr, Joe has done.

Just a small 'error' where there shouldn't be one, that kind of stuff should mke the hairs on the back of your neck stand up. And, if it doesn't, do you really know your subject well enough? In real life, you need to be good enough to notice this kind of thing.