Question

A student performs an experiment to determine the density of a sugar solution. They obtain the following results: 1.71 g/mL, 1.73 g/mL, 1.66 g/mL, 1.68 g/mL. If the actual value for the density of the sugar solution is .35 g/mL, which statement below best describes the results?

A. results are precise, but not accurate.
B. results are accurate, but not precise.
C. results are both precise and accurate
D. results are neither precise nor accurate.
E. It isn't possible to determine with the information given.

Answer 1

Answer:

Correct answer is A. results are precise, but not accurate.

Explanation:

Accuracy refers to how close is the obtained value from the true value. In this case, the obtained values are far from the true value, being the density of the sugar solution .35 g/ml and value obteined are between 1.66 g/ml and 1.73 g/ml. In terms of density true value and values obtained in experiment are really different. So, results are not accurate.

Precision refers to the dispersion of values obtained, this means how close are values obtained from each other. Precision doesn't take into account the true value. In the experiment described, results are close to each other. So, results are precise.