9.11 Understanding Accuracy and Precision

Which of the following best describes precision in measurements?

• The ability to measure small differences in a quantity.

• The closeness of a measured value to a standard or known value.

• The consistency of repeated measurements.

• The number of significant figures in a measurement.

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DOK Level 1: Recall

In an experiment to determine the effect of sunlight on plant growth, what is the independent variable?

• The amount of water given to the plants.

• The type of soil used.

• The amount of sunlight the plants receive.

• The growth rate of the plants.

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DOK Level 2: Skill/Concept

In a study examining the impact of study time on test scores, what is the dependent variable?

• The number of hours spent studying.

• The test scores.

• The difficulty of the test.

• The time of day the test is taken.

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DOK Level 2: Skill/Concept

Which of the following statements is true about accuracy?

• It refers to how close a series of measurements are to one another.

• It is not affected by systematic errors.

• It is the same as precision.

• It refers to how close a measurement is to the true value.

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DOK Level 1: Recall

If a scientist measures the boiling point of water several times and gets values close to 100°C each time, what can be said about the precision of the measurements?

• The measurements are accurate.

• The measurements are precise.

• The measurements are neither accurate nor precise.

• The measurements are both accurate and precise.

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DOK Level 2: Skill/Concept