Worksheet: Accuracy, Precision, and Repeatability

In this worksheet, we will practice distinguishing between and describing the accuracy of measurements and their precision and repeatability.

Q1:

The concentration of a solution is known to be 0.101 M. A student determines the concentration to be 0.088 M, 0.087 M, and 0.089 M for each titration performed. Which of the following best describes these results?

  • AThe results are neither accurate nor precise.
  • BThe results are accurate but not precise.
  • CThe results are both accurate and precise.
  • DThe results are precise but not accurate.
  • ENot enough information is given to determine accuracy or precision.

Q2:

Which of the following data sets is the most precise?

  • A 12.4 g, 15.0 g, 13.9 g
  • B 13.2 g, 13.2 g, 13.4 g
  • C 22.6 g, 22.6 g, 36.8 g
  • D 12.1 g, 12.2 g, 12.1 g
  • E 16.7 g, 16.8 g, 16.9 g

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