Experimental Design and Variables

The video explains how scientists set up experiments to test hypotheses using variables. It uses an example of a hypothesis about plant growth with energy drinks. The video defines control and variable groups, and explains independent and dependent variables, emphasizing how the dependent variable depends on the independent variable. The conclusion summarizes the roles of these variables in scientific experiments.

What is the primary method scientists use to test their hypotheses?

• By setting up experiments with variables

• By reading scientific literature

• By making observations

• By conducting surveys

In the example hypothesis, what is being tested?

• If sunlight affects plant growth

• If water affects plant growth

• If energy drinks affect plant growth

• If temperature affects plant growth

What is the purpose of a control group in an experiment?

• To serve as a baseline for comparison

• To test multiple variables

• To increase the sample size

• To ensure the experiment is valid

Which group in an experiment receives the variable being tested?

• Experimental group

• Variable group

• Control group

• Placebo group

What is the independent variable in the plant growth experiment?

• The type of plant

• The amount of sunlight

• The soil type

• The energy drink

What does the dependent variable represent in an experiment?

• The factor that is ignored

• The factor that is controlled

• The factor that is measured

• The factor that is changed

Why is the energy drink considered the independent variable?

• Because it is the factor being observed

• Because it is the factor being ignored

• Because it is the factor being controlled

• Because it is the factor being measured

How does the dependent variable relate to the independent variable?

• It is independent of the independent variable

• It is controlled by the independent variable

• It depends on the independent variable

• It is unrelated to the independent variable

What is the main role of the control group in this experiment?

• To provide a comparison for the variable group

• To receive the energy drink

• To ensure all plants grow equally

• To test a different hypothesis

What is the ultimate goal of setting up an experiment with variables?

• To test the effect of one variable

• To observe natural phenomena

• To create new variables

• To prove a hypothesis correct