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Stage 1
Answer 4 questions correctly in a row.

The passage below describes an experiment.

a tennis ball

Janet was playing tennis on a hot summer day. When she hit a ball that had been left on the court, she was surprised to find that it bounced more than the brand new ones she had just opened! She thought it must have something to do with the ball's temperature. Janet and her friend gathered nine new tennis balls. They put three in the freezer, left three outside in the hot sun, and left three on the kitchen table at room temperature. Thirty minutes later, Janet took all the balls and dropped each one from the top of a 10-foot ladder. Her friend measured how high each one bounced. They then calculated the average bounce height for each temperature.

Identify the independent and dependent variable in this experiment.

the height of the ball's bounce

the ball's temperature

independent variable

dependent variable