Accuracy, Precision, and Percent Error
Accuracy, precision, and percent error are fundamental concepts in the realm of measurement and data analysis. These terms play a pivotal role in assessing the quality and reliability of experimental results. Accuracy refers to how closely a measurement aligns with the true or accepted value, while precision gauges the consistency and repeatability of measurements. Percent error, on the other hand, quantifies the deviation between a measured value and the expected value. Mastering these concepts is crucial in various scientific and technical disciplines, ensuring the integrity of data and the validity of conclusions drawn from experimental findings.
Questions
- A student estimated a mass to be 250g, but upon carefully measuring it, found the actual mass to be 240g. What is the percent error?
- What are 3 sources of error that would account for differences in measurement of the same thing?
- What is the degree to which a measurement approaches a standard value?
- A student measured the mass of a small object and found it to be 56.0 grams. The object's mass is known to be 55.0 grams. What is the percent of error in the student's measurement?
- These data show repeated measurements of the same object which has a known mass of 5.38 grams. Which measurement is most accurate?
- What are the differences between systematic errors and random errors?
- Accuracy refers to the freedom from error or mistake of a measuring device. How accurate is a volumetric flask as a measuring instrument?
- Is precision a measure of how close an answer is to the actual or expected value?
- A student obtains a percent error of 20% after finding that the true value for the mass of an object is 50 grams. What is the student's value?
- Which is the most accurate method for measuring volumes of liquids, a beaker or a graduated cylinder?
- What is the process of deliberately adding very small amount of impurities to a pure substance called?
- What are two good scientific reason to account for any experimental error?
- What is precision error in chemistry?
- The melting point of a white solid substance was determined in four repeated trials to be 56.0°C, 55.0°C, 57.5°C, 55.5°C. What temperature should be reported as the melting point as a result of these trials?
- Given the following, what the actual volume of the pipet?
- What is percent error/percent deviation?
- Is it possible to be precise but not accurate?
- What percent error is too high?
- How would you define accuracy and precision?
- An experiment produced 0.10 g #CO_2#, with a volume of 0.056 L at STP. If the accepted density of #CO_2# at STP is 1.96 g/L, what is the approximate percent error?