Experimental Design

The variable that is measured.

• Controlled Variable/Constants

• Dependent Variable

• Independent Variable

The factors that stay the same during an experiment.

• Controlled Variable/Constants

• Dependent Variable

• Independent Variable

Angelina set up an experiment to see how the mass of a ball affects the distance it rolls off a ramp. Identify the independent variable.

• Distance traveled by the ball
• Height of the ramp
• Mass of the ball
• Who set up the experiment (Ms. S, etc)

Tags

NGSS.MS-PS2-2

How does watching TV during studying affect a student’s test grades? Student's grades are the....

• independent variable

• dependent variable

An apple’s freshness will last longer if they are refrigerated. If you did an experiment to test this, the freshness would be the...

• independent variable

• dependent variable

Suppose that a scientist proposes a hypothesis about how a newly discovered virus affects humans. Other virus researchers would likely:

• Reject the hypothesis right away

• Change their hypothesis to fit their own findings.

• Design new experiments to test the proposed hypothesis.

• Assume the hypothesis is true for all viruses.

How many independent variables should you test at a time?

It is raining outside

• observation
• inference

Tags

NGSS.MS-ESS2-4

NGSS.MS-ESS2-5

The factor that a scientist changes during an experiment.

• Controlled Variable/Constants

• Dependent Variable

• Independent Variable

Lita wants to know how drinking milk affects Monica's growth. What is the independent variable?

• Monica's growth

• drinking milk

Tags

NGSS.MS-LS1-5