Experimental Design

A florist wants to see if Product X will extend the life of cut flowers so that they last longer. What is the dependent variable?

• The life of the flowers

• Product X

Tags

NGSS.HS-ETS1-3

You think that a certain part of your brain is important in memory. To test this, you will remove this part of the brain from rats and see if they remember how to get through the maze. What is the independent variable in this experiment?

• Remembering how to get through the maze

• Removal of certain part of the brain

You want to test a new drug that supposedly prevents sneezing in people allergic to grass. What is the independent variable?

• sneezing

• grass

• the new drug

You want to see if playing music makes plants grow taller. What is the independent variable in this experiement?

• Height of the plant

• Music being played

You want to test a new drug that supposedly prevents sneezing in people allergic to grass. What is the dependent variable?

• The new drug

• Sneezing

• Grass

A soap manufacturer wants to prove that their detergent works better to remove tough stains. What is the dependent variable?

• Removal of stains

• Detergent

An entomologist (bug scientist) wants to determine if temperature changes how many times a cricket chirps. What is the dependent variable?

• Temperature

• Crickets

• Number of times cricket chirps

You want to measure the effect of different amounts of oxygen on the rate of yeast growth. What is the independent variable?

• Bread

• Amount of oxygen

• Rate of yeast growth

Tags

NGSS.HS-LS2-3

Orchids were studied to determine if the amount of humidity affected the flowering of these plants. Which of these was the independent variable in this study?

• Amount of humidity

• Amount of water

• Flower

Ms. Fiore wanted to see how different types of music affected students' pulse rates. She played different types of music: heavy metal, rap, R&B, alternative, pop, country, and classical music. Identify the dependent variable.

• Ms. Fiore

• Types of music

• Pulse rate