A laboratory instructor gives a sample of powdered metal to each of four students, A, B, C,and D, and they weigh the samples. The results of their multiple trials follow. The true value is 8.14 g.
A: 8.34 g, 8.32 g, 8.35 g
B: 8.51 g, 8.28 g, 8.05 g
C: 8.19 g, 8.14 g, 8.09 g
D: 8.2 g, 8.24 g, 7.98 g
Use these figures to answer the following questions. (For each question, enter the letter(s) for the correct student(s) in the answer box.)
(a). Calculate the average mass from each set of data. Which set(s) is(are) most accurate?
Precision and accuracy are not the same thing! Make sure you understand what each term means.
(b). Precision is a measure of the average of the deviations of each piece of data from the average value. Which set(s) of data is(are) the most precise?
(c). Which set of data has the best combination of accuracy and precision?
(d). Which set of data has the worst combination of accuracy and precision?

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