Certified Pulmonary Function Technologist (CPFT) Practice Exam

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How is precision defined in measurement equipment?

  1. Ability to measure accurately

  2. The same result achieved every time, regardless of accuracy

  3. Average of multiple measurements

  4. Variation among repeated measurements

The correct answer is: The same result achieved every time, regardless of accuracy

Precision in measurement equipment is defined as the ability to achieve the same result each time a measurement is taken, regardless of how close that result is to the actual or true value. This concept highlights the consistency and repeatability of measurements. When precision is high, repeated measurements will yield results that are very similar to each other, even if those results might not accurately reflect the true value; they can still be far from it. In contrast to accuracy, which refers to how close a measurement is to the actual value, precision focuses solely on the reliability of the measurements in producing similar results over multiple trials or instances. For example, a scale that consistently shows 5 pounds when the true weight is 10 pounds is considered precise but not accurate, as it provides consistent results, though they are not correct. Understanding precision is crucial in various scientific fields, including pulmonary function testing, where repeated measurements are analyzed to determine lung function accurately.