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I would argue that any lab in which the goal is to measure the %
difference between their value and the "accepted" value teaches the
students nothing of value, and in most cases does just the opposite.
First, it teaches the students that experiments are not to find out
anything new, but to verify what we already know, and second it leads
to what we used to call in the Navy, "gundecking" the results--that
is, making the results give the "right" answer. Furthermore, the
"accepted" value is the accumulated best experimental results, and
not in any sense "correct." so calculating the % difference between
the two is pretty meaningless, and particularly confusing when the
"accepted value is zero, since any % difference from zero is
automatically infinite.
It is much better to design experiments that have no pre-known
answer, and show them how to 1) estimate a statistical uncertainty
value, and 2) look critically at the experimental setup and try to
figure out what, if any, systematic error might be present due to the
experimental design.