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Homework Help: Use math to prove which lab equipment was precise/accurate?

  1. Sep 19, 2017 #1
    1. The problem statement, all variables and given/known data
    We performed an experiment to see which laboratory glassware was more accurate and which was more precise. Question: (a): Which glassware was more precise and why? (b) Which glassware was more accurate and why? Use the calculations to support your statement.

    I won't post the actual values, but I calculated the following for each type of glassware (e.g. beaker, graduated cylinder): mean volumes measured, mean volumes calculated, standard deviations of calculated volumes, relative standard deviation.

    2. Relevant equations
    1. Precision-how close a bunch of measurements are to each other
    2. Accuracy-how close a measurement is to a true value

    3. The attempt at a solution
    I believe that the pipettes were the most accurate and precise. I believe it was accurate because the mean measured volume was very close to the true volume calculated. I believe it was precise because it also had the smallest standard deviations, so the measurements were close to each other. It also had the smallest percent error out of all the glassware tested.

    Am I thinking about this correctly?
    Thank you!
  2. jcsd
  3. Sep 19, 2017 #2


    User Avatar
    2017 Award

    Staff: Mentor

    Sounds reasonable.
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