Question: Three students (Hasmita, Roberto and Lynette) are measuring the density of aluminum, which has an accepted value of 7.87 g/mL. Each student performs four trials.

Three students (Hasmita, Roberto and Lynette) are measuring the density of aluminum, which has an accepted value of 7.87 g/mL. Each student performs four trials. Their results are on the table below.

Hasmita

Roberto

Lynette

Trial #1

8.89 (g/cm3)

6.48 (g/cm3)

7.88 (g/cm3)

Trial #2

8.90 (g/cm3)

8.15 (g/cm3)

7.87 (g/cm3)

Trial #3

8.91 (g/cm3)

7.12 (g/cm3)

7.86 (g/cm3)

Trial #4

8.89 (g/cm3)

7.89 (g/cm3)

7.90 (g/cm3)

Classify each students values according to their accuracy and precision.

Hasmita's values are:

Roberto's values are:

Lynette's values are:

Which student's values show systematic error?

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