Exploring Variables in the Scientific Method

The video tutorial explores the concept of variables in scientific experiments, using an example involving aphids and coconut oil. It explains the roles of independent, dependent, and controlled variables, and discusses how to design a controlled experiment. The video also emphasizes the importance of sample size and repeatability in experiments, and provides additional examples to practice identifying variables.

What is the primary purpose of a hypothesis in a scientific experiment?

• To list the materials needed

• To summarize the results

• To provide an explanation that can be tested

• To make a prediction

In the aphids and rose bushes experiment, what is the independent variable?

• Size of the rose bushes

• Number of sprays

• Temperature of coconut oil

• Number of aphids at the end

Which of the following best describes a dependent variable?

• It remains constant throughout the experiment

• It is what is measured or observed

• It is what the researcher changes

• It is not important in the experiment

Tags

NGSS.MS-PS3-4

Why are controlled variables important in an experiment?

• They are the variables that change during the experiment

• They are not necessary for a valid experiment

• They are the main focus of the experiment

• They help to ensure that the results are due to the independent variable

Tags

NGSS.MS-PS2-2

What is one way to increase the reliability of an experiment?

• Use fewer samples

• Change multiple variables at once

• Conduct the experiment only once

• Increase the sample size and conduct multiple trials

In the plant growth experiment, what is the independent variable?

• Type of soil

• Amount of light

• Amount of water

• Height of the plant

Tags

NGSS.MS-LS1-5

In the plant growth experiment, what is the dependent variable?

• Height of the plant

• Amount of water

• Amount of light

• Type of soil

Tags

NGSS.MS-LS1-5

In the paper airplane experiment, what is the independent variable?

• Size of the airplane

• Type of paper

• Design of the airplane

• Distance traveled

In the paper airplane experiment, what is the dependent variable?

• Type of paper

• Design of the airplane

• Size of the airplane

• Distance traveled

Tags

NGSS.MS-ETS1-3

Which of the following is a controlled variable in the paper airplane experiment?

• Size of the airplane

• Distance traveled

• Type of paper

• Number of throws