akland.edu/mod/quizjattempt.php?attempt-3021439 Faculty Get Help 10-General Chem

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akland.edu/mod/quizjattempt.php?attempt-3021439 Faculty Get Help 10-General Chemistry Lab I OExperiment #1-Accuracy & PrecisionExp #1 Acoracyard Precision Pro-Lab Quiz Question 1 Answer saved Points out of 1.0 Flag question Two students weigh an object five times with the following results: Student A: mean 5.555 g, standard deviation 0.008 Student B: mean 5.570 g, standard deviation 0.018 which student's results are more precise and which more accurate? Select one: a. A less precise and more accurate b, A more precise but insufficient data to judge accuracy. C. A less accurate but insufticient data to judge precision d. A less precise but insufficient data to judge accuracy. e. A more precise and more accurate

Explanation / Answer

Accuracy refers to how close the obtained data is to the actual value/accepted value of some entity like weight here.Since the information about the actual weight is not given so nothing can be concluded about the accuracy here.

Precision tells how close the results can be expected if repeated number of trials are done like here five trials are done.That is the variation we see when repeatedly measure the weight when measured by same device.Even if the values are far from the actual value precision can be high(good precison) but accuracy will be low.The one having low standard deviation will be more precise.So answer will be option b).

Comment in case of any doubt.I hope I have helped.

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