Sorry for delayed answer! End of the semester and lots of things to do

Moving on..
Fair points are being made by both of you. I was confused myself when he told me this. I did at first offer him the 5% range possibility, but he shrugged it off.
RA, LA and LL were connected to accordingly (pins that were marked accordingly). I didnt check the LA/LL switch (the lab is now done and I can't really go and check it), but we used LL position. Also, someone did switch the LA/LL switch, but I don't remember why it came up and would it be relevant to this case. I will check with him and let you know later!
However, let's not forget the fact that I'm still a first year student (in masters) and there could be things I myself am missing here and can't deliver. :P
On a site note: the monitor did show both signals (HR waves and RR sinewave), but it just didn't show the RR value, which means that the signal was measured, right?
Edit: The guy who tried switching the LA/LL switch said the respiration wave flatlined after switching to LA.