The density of copper is listed as 8.94 g/cm3.Two students each make three density determinations of samples of the substance. Student A’s results are 7.3 g/mL, 9.4 g/mL, and 8.3 g/mL. Student B’sresults are 8.4 g/cm3, 8.8 g/cm3, and 8.0 g/cm3.Compare the two sets of results in terms of precision and accuracy.
Answers
Answer:
Student A's answer was accurate but not precise. Student B's result was accurate and precise
Explanation:
Since the results of each trial was close to one another. Both studentA and B had an average density that was 0.5 away from actual density.
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Accuracy—how close a measurement is to the true or actual value ("hit the bullseye")
Precision—how close several measurements are to each other (hit the same spot on dartboard)
The average of student B is 8.40 g/cc.
The average of student A is 8.33 g/cc.
The range of A is 8.0-8.8 or 0.8 from low to high.
The range of B is 7.3 to 9.4 or 2.1 from low to high
Student A's measurements would be neither accurate nor precise.
Student B's measurements are more precise than Student A's
however I would not consider these measurement either accurate or precise.