Three students make measurements of the length of a 1 50 meter rod Each student reports an uncertainty estimate representing an

Question

Three students make measurements of the length of a 1 50 meter rod Each student reports an uncertainty estimate representing an independent random error applicable to the measurement Alice A single measurement using a 2 0 meter long tape measure to within 12 mm Bob Two measurements using a wooden meter stick each to within 2mm which he adds together Christina Two measurements using a machinist s meter ruler each to within 11 mm which she adds together The students teacher prefers measurements that are likely to have less percentage relative error Which is the correct order of preference A Christina s is preferable to Alice s which is preferable to Bob s Your Answer B Alice s is preferable to Christina s which is preferable to Bob s CAlice s and Christina s are equally preferable both are preferable to Bob s Correct Answer Christina s is preferable to both Alice s and to Bob s which are equally preferable

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