A custodian notices some dirty tables and wants to know which cleaner is the best to use. He tests three different cleaners and looks at how well they clean compared to tap water. What is the control group?

An experiment is being done to determine how light affects the growth of small zinnia plants. One plant is placed in full sunlight, the second in a shaded area, the third in an unlit closet. What is a control in this experiment?

A study was created to test the effects of jazz on people’s sleep patterns. The hypothesis of the experiment was that if people listened to jazz music as they fall asleep, they will sleep for longer periods of time. For the experiment, 2 groups of people were created. One group was placed in a quiet room where they went to sleep and they were timed on how long they slept. The other group was placed in a room where jazz music played softly as they began to sleep and played throughout the night. As each group awoke, their sleep times were monitored. What is the control group?

A study was created to test the effects of jazz on people’s sleep patterns. The hypothesis of the experiment was that if people listened to jazz music as they fall asleep, they will sleep for longer periods of time. For the experiment, 2 groups of people were created. One group was placed in a quiet room where they went to sleep and they were timed on how long they slept. The other group was placed in a room where jazz music played softly as they began to sleep and played throughout the night. As each group awoke, their sleep times were monitored. What is the experimental group?

A study was created to test the effects of fear in children. The hypothesis of the experimenters was that if babies were exposed to fuzzy bunnies and at the same time a loud cymbal was struck close behind them, then that child would be afraid of all fuzzy things. Another group of children would be exposed to bunnies without any loud noises. The study was carried out as planned and as a result, hundreds of young children developed fear of all cute furry bunny rabbits. What is the control group in this experiment?

Mr. Batchelder wants to know if the the number of games he watches the Cardinals play each season has an effect on the number of games they win. Mr. Batchelder decides to run this experiment over three football seasons. The first season he watches none of the games the Cardinals play. The second season he watches 50% of the games they play. The third season he watches 100% of the games they play. He watches all the games from the same spot on his couch and wears his lucky tie. What is the control group?

Mr. Batchelder wants to know if the the number of games he watches the Cardinals play each season has an effect on the number of games they win. Mr. Batchelder decides to run this experiment over three football seasons. The first season he watches none of the games the Cardinals play. The second season he watches 50% of the games they play. The third season he watches 100% of the games they play. He watches all the games from the same spot on his couch and wears his lucky tie. What is the experimental group?

A company wants to sell more sports drinks, so they decide to add more sugar.  

For Group A they give them Gatorade with an added teaspoon of sugar.

For Group B they give them plain Gatorade without adding sugar.

Which Group is the CONTROL GROUP?

In the experiment shown, the experimenter wanted to know if her plants would still grow taller if she gave them liquids other than water. plant A received 50 mL of coke each day, plant B received 50 mL of juice, and plant C received 50 mL of water.  Every day for one week, plant growth was measured. 

Which group served as the control group?

Steve wanted to see if different types of fertilizer influence sunflower growth.

What is the control group?