Quiz 003: Experimental Design

What is a controlled experiment?

• An experiment that includes the use of a control group

• An experiment that does not include any variables

• An experiment that only tests one variable

• An experiment that is conducted without any control

Which of the following is true about the control group?

• It is exposed to all the same conditions as the experimental group except the independent variable

• It is exposed to different conditions than the experimental group

• It is the group that receives the experimental treatment

• It is the group that is not used for comparison

What are constants in an experiment?

• Quantities/variables a researcher changes during an experiment

• Quantities/variables a researcher holds steady during an experiment

• Quantities/variables that are not recorded in an experiment

• Quantities/variables that are only used in control groups

Which groups are exposed to the same constants in an experiment?

• Only the experimental group

• Only the control group

• Both the experimental and control groups

• Neither the experimental nor the control groups

What is one characteristic of a "good" experiment?

• Tests multiple variables at a time

• Tests one variable at a time

• Tests no variables

• Tests random variables

Why must a "good" experiment be fair and unbiased?

• To allow the experimenter to influence the results

• To ensure the experimenter’s opinions affect the outcome

• To prevent the experimenter’s opinions from influencing the experiment

• To make the experiment more complex

What does it mean for an experiment to be repeatable?

• The experiment can be repeated with the same or similar results

• The experiment cannot be repeated

• The experiment must be different each time

• The experiment results must vary each time

What is the validity of an experiment a measure of?

• How interesting the results are

• How "correct" or trustworthy the results are

• How quickly the experiment was conducted

• How many people conducted the experiment

Tags

NGSS.HS-PS4-4

Which of the following can improve the validity of an experiment?

• Decreasing the amount of constants

• Having a small sample size

• Adding a control group

• Conducting the experiment only once

Tags

NGSS.MS-PS2-5

What is one way to improve the validity of an experiment?

• Increasing the amount of constants

• Reducing the number of trials

• Using a smaller sample size

• Ignoring the control group

Tags

NGSS.MS-ETS1-4

NGSS.MS-PS2-5