First, Tony, Alex and Cody were each asked to measure out 4.5mL of water into 3 graduated

cylinders of their choice.

Next, the boys are instructed to pour their graduated cylinders filled with 4.5

mL of water into a 5mL graduated cylinder if not already in one. Then they were told to write down how much water they had put in each

graduated cylinder to the closest tenth of a milliliter.

Results Name of Boy

Trial One

Trial Two

Trial Three

Tony 4.5 mL 4.5 mL 4.5 mL

Alex 4.4 mL 4.6 mL 4.5 mL

Cody 6.0 mL 4.4 mL 4.5 mL

Questions About the Experiment

1. Considering accuracy is determined by how well measurements agree with their true value, who had the best accuracy? Who had satisfactory accuracy? Who had no accuracy?

2. Considering precision is determined by agreement of trials, who was the most precise? Who had no precision?

3.Who was both very precise and had the best accuracy?4. Who had neither precision or accuracy?5. Who was just accurate?

Answers

1. Best accuracy: Tony Satisfactory accuracy: Alex No Accuracy: Cody

2. Most precise: Tony No precision: Cody

3. Tony4. Cody5. Alex