1. A scientist working with new fibers for a tennis ball covering wants to compare the "bounce" of the balls with different coverings. One test will consist of dropping balls with each covering from a specified height and counting the number of times it bounces. Explain why it is better to use several different balls with each covering, rather than dropping the same ball repeatedly.
2. A student wants to measure the volume of liquid in cans of soft drink to see how it compares to the nominal volume of 12 oz. printed on the can. Suggest some sources of measurement error in this experiment, and discuss how the measurement errors could be reduced or avoided.