Quiz
1. What is the absolute uncertainty for the answer to the following
calculation? The given uncertainties are absolute. Show your
work.
23.1 (±0.6) / 10.2 (±0.4)
A. 0.05
C. 0.7
B. 0.1
D. none of these
2. Which of the following has the highest relative uncertainty? The
given uncertainties are absolute.
A. 1.0 (±0.6)
C. 5 (±3) x 104
B. 10 (±6)
D. they are all equal
Quiz
3. In one short complete sentence explain qualitatively (do not give
the equation) what standard deviation represents. Write
clearly!
Standard deviation represents the variation of results around a
mean value due to random errors.
or
Standard deviation represents the precision in a set of data.
4. Two students both measured the amount of chromium contained
in a water sample. Student A measured 6.8 (±0.2) parts per
billion chromium. Student B measured 6.5 (±0.7) parts per
billion chromium. Which students’ results are more precise?
A.
B.
C.
D.
Student A
Student B
they are equally precise
precision cannot be determined with the available
data