Variables & Groups

The variable that you measure is the -

• Independent

• Dependent

• Constant/controlled

• Repeated Trial

Which of the following is used to compare all your data to? (Tells you that your data is correct)

• Independent variable

• Dependent variable

• Experimental group

• Control group

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, what is the independent variable?

• Type of plant
• Water, apple juice, milk
• Plant growth

Mr. S normally uses praise as a reward to train his dog. He wants to know the best way to train his dog, so he sets up an experiment to find out if there is a better way to get his dog to respond to commands. What is his dependent variable?

• Type of reward
• Praise
• Type of dog
• Amount of time the dog follows commands

Mr. S. sets up an experiment to see how the mass of a ball affects the distance it rolls off a ramp.  Identify the constant.

• distance traveled by the ball
• height of the ramp
• mass of the ball
• weight of the ball

Tiffany was investing how fast it took Hayden to react to different sounds. Identify the dependent variable. 

• different sounds
• how much time it took Hayden to react
• Hayden
• the trumpet playing over and over

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?

• Group A
• Group B
• The Gatorade
• The Company

In the experiment shown, 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?

• Plant A
• Plant B
• Plant C
• There was no control group

What is the group in an experiment that receives treatment with the independent variable?

• control group

• experimental group

Students wanted to see if the type of material affected the temperature after being placed under a heat lamp for 10 minutes.

What is the dependent variable for this investigation?

• Type of material (rocks, sand etc)

• Temperature after 10 minutes

• Time under the lamp

• Heat lamp, amount of material