1. Study Guide for Quiz Be able to identify the missing part of an experiment. Use this guide to quiz yourself. Use your flip notes and flip lessons for more help.

2. 1. What is missing from this experiment: A student wanted to see if tennis balls bounce higher on a cement court or an asphalt court, so she dropped a tennis ball 10 times on a cement court and measured how high they bounced.

3. 1. What was missing? A. a dependent variable B. a control group for comparison C. an independent variable D. data

4. What is wrong with this? 2. A student studying how high tennis balls bounce on different courts, dropped a ball from 4 feet on the cement court. Then she dropped a ball from 5 feet on the asphalt court. She measured the height of every bounce.

5. 2. What was wrong with that? A. There was no control group. B. There was no dependent variable. C. There was more than one independent variable D. There were no data to analyze.

6. What is wrong with this? 3. A student wanted to know if tennis balls bounced differently on asphalt and cement courts. She dropped the tennis ball on the cement court on a 100 degree day. She dropped the ball on the asphalt court on a 86 degree day and it had been raining. She measured the height of bounces.

7. 3. What was wrong with that? A. She failed to keep everything constant except for her independent variable. B. She failed to collect data. C. She did not have a dependent variable. D. She should have used different kinds of balls.

8. What is wrong with this? 4. A student wanted to see if tennis balls bounce differently on different kinds of courts. She had volunteers throw the balls down to see who could make the balls bounce higher. She had volunteers do this on a cement court and other volunteers do this on an asphalt court. She measured the height of the bounces.

9. 4. What was wrong with that? A. She did not have data to analyze. B. Some volunteers might be stronger than others. C. There was no dependent variable. D. There was nothing to compare.

10. What is wrong with this? 5. A student wanted to see if tennis balls bounce differently on different courts. She played tennis on an asphalt court. Then she played soccer to see which sport is more fun.

11. 5. What was wrong with that? A. The experiment did not attempt to answer the question. B. There were no data to analyze. C. There was no dependent variable to measure. D. All of the above

12. The Answers 1.B A control group is needed to compare the difference. 2.C The independent variable is the one thing you make different in your experiment. 3.A You keep everything constant except your one independent variable 4.B Only one thing can be different. Throwing the ball down introduces variables. 5.D