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

Which variable is placed on the x-axis?

• Controlled variables (constants)

• Dependent variable (responding variable)

• Independent variable (manipulated variable)

• Control group

Tags

NGSS.MS-PS3-1

Which variable is placed on the y-axis?

• Controlled variables (constants)

• Dependent variable (responding variable)

• Independent variable (manipulated variable)

• Control group

Tags

NGSS.MS-PS3-1

Check the actions that are best practices to make the results of an experiment reliable or trustworthy.

• Using many subjects or samples in each group (20+)

• Repeating the experiment

• Using a graph to display your data

• Writing long and complex sentences in your report

Tags

NGSS.MS-PS3-1

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-LS2-4

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

Tags

NGSS.MS-LS1-5