Experimental Design Review

The one variable you change and test in an experiment to see if it has an effect

• Controlled variables (constants)

• Dependent variable (responding variable)

• Independent variable (manipulated variable)

• Control group

The variables that are kept the same for ALL subjects and samples in an experiment

• Controlled variables (constants)

• Dependent variable (responding variable)

• Independent variable (manipulated variable)

• Control group

The subjects or samples that do not receive the experimental treatment in a study and are used for comparison

• Controlled variables (constants)

• Dependent variable (responding variable)

• Independent variable (manipulated variable)

• Control group

The variable you measure in an experiment to determine how much of an effect was caused

• Controlled variables (constants)

• Dependent variable (responding variable)

• Independent variable (manipulated variable)

• Control group

Tags

NGSS.MS-PS3-4

Research study: "The effect of sunscreen chemicals on the health of staghorn coral"

What is the independent variable?

• Sunscreen chemicals

• Health of staghorn coral

• Water temperature

• Amount of light

Tags

NGSS.MS-ESS3-4

Research study: "The effect of light color on the growth of spinach plants"

What is the dependent variable?

• Light color

• Growth of spinach plants

• Amount of water

• Type of soil

Tags

NGSS.MS-LS1-5

Research study: "The effect of different amounts of light on the growth of moss"

What would be a controlled variable in this study?

• Amounts of light

• Growth of moss

• Some grown indoors, some grown outdoors

• Amount water or moisture

Do tree frogs jump farther than blue dart frogs? What would be a controlled variable in this experiment?

• Types of frogs

• Distance jumped

• Where the frogs are jumping

Do sunflowers grow taller in direct sunlight or partial sunlight? What is the dependent variable?

• Amount of sunlight

• Type of sunflower

• Height of sunflower

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Which brand of laundry soap works better to remove grass stains? What would be the controlled variables in this experiment? Choose all that apply.

• Brand of soap

• Material that grass stains are on

• How grass stain was treated

• Amount of soap used to remove stains

Tags

NGSS.MS-ETS1-3