A laboratory instructor gives a sample of powdered metal to each of four student

Question

A laboratory instructor gives a sample of powdered metal to each of four students, I, II, III, and IV, and they weigh the samples. The results of their multiple trials follow. The true value is 8.72 g.
I : 8.70 g, 8.74 g, 8.70 g
II : 8.56 g, 8.77 g, 8.83 g
III : 8.50 g, 8.48 g, 8.51 g
IV : 8.41 g, 8.72 g, 8.55 g

(a) Calculate the average mass from each set of data.
I
.......g
II
......g
III
......g
IV
......g
Tell which set is the most accurate.
I, II, III, IV

(b) Precision is a measure of the average of the deviations of each piece of data from the average value. Which set of data is the most precise?
I, II, III, IV

Is this set also the most accurate?
yes
no


(c) Which set of data has the best combination of accuracy and precision?
I, II, III, IV

(d) Which set of data has the worst combination of accuracy and precision?
I, II, III, IV

Explanation / Answer

I) 8.713 II)8.72 III)8.497 IV)8.56 Set II is the most accurate b) Set I is the most precise no this set is not the most accurate c) Set I has the best combination of accuracy and precision d) Set III has the worst combination of Accuracy and Precision

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