Two students are working on an AP Chemistry lab. Their assignment is to determine experimentally the density of a nonvolatile organic liquid, limonene. The accepted value for the density of limonene is 0.8422 g/mL. Each student conducts three separate density determinations and then calculates a mean (average) value for the density and the standard deviation for their three trials.
The results and calculations for each student are shown in the table below.
|Student A||Student B|
|Density #1||0.8421 g/mL||0.8408 g/mL|
|Density #2||0.8514 g/mL||0.8502 g/mL|
|Density #3||0.8355 g/mL||0.8332 g/mL|
|Mean Density||0.8430 g/mL||O.8414 g/mL|
Of the four descriptions given below, which of the following BEST interprets the accuracy and precision of Student A and Student B?