Variables, Constants, and Control Groups

Mr. McNiece 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 independent variable.

• classical music resulted in the highest pulse rate
• high pulse rate
• pulse rate
• types of music

Mr. McNiece 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. What constant should be considered when doing this experiment?

• types of music
• use all dead people
• using a different student for each music type
• amount of time the music was played

Nick wanted to see how high an ice cube would float in different temperatures of water. Identify the independent variable.

• amount of water
• height of ice cube
• temperature of water
• size of ice cube

Mr. McNiece 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 independent variable. 

• pulse rate
• types of music
• classical music resulted in the highest pulse rate
• Mr. McNiece

Tiffany was investing how fast it took Hayden to react to different sounds. Identify the dependent variable. 

• different sounds
• how much time it took Hayden to react
• Hayden
• the trumpet playing over and over

Nick wanted to see how high an ice cube would float in different temperatures of water. Identify the dependent variable.

• amount of water
• temperature of water
• height of ice cube
• temperature the ice cube was at its' highest height

Mario studied how far room temperature water would spurt out of a platic milk carton when 3mm holes were punched at different heights from the bottom of the container. Identify the dependent variable

• 3 mm holes
• distance water traveled out of carton
• different heights of holes in container
• ice water from Iceland