Apologia Chemistry: Precision

We finally finished the Density lab and began Accuracy and Precision. (This lab also teaches these concepts.)  I use an IPS lab which employs a Solo cup, ruler, and sponge.  The kids drop wet sponges into a Solo cup 30 times from a known distance and record the distance from the cup.  If the sponge lands in the cup the measure is 0; if the sponge lands outside the cup, the students measure (with a ruler) the distance the sponge lands from the cup.  Really.  The kids like this lab.  I have them calculate the mean, median, and mode for the 30 measures they record in a data table.

Here are pre-lab questions:
1. What is an accurate measurement in this experiment?
2. Where should the dropped sponges be measured from?
3. Should there be any regulations on how the student on the chair should stand? (Decide if you'll permit them to stand on a chair.)
4. What unit of measure should the class use to measure the dropped sponges? (cm or mm)

Post-Lab questions:
1. What was your most accurate measurement?  Why was it the most accurate?
2. Were your measurements precise?  Explain.
3. Can just one measurement be considered precise?  Accurate?  Explain.
4. Can measurements be precise, but NOT accurate?  Explain.
5.  Compare the mean, median, and mode.  Are they similar or different?
6.  Evaluate your procedure.  Was there enough detail?  What would you change?
7.  Did the data table you constructed fit the data you collected.

Conclusion.
Differentiate between accuracy and precision