Experimental Design and Variables

I am doing a test to see if there is a connection between how long you run and how fast your heart beats. I will be performing an experiment where a person will run for a 1 minute and I will check their heartbeat. Then they will run for 2 minutes and I will check their heart rate. I will do this up to 6 minutes and see if there is a connection. WHAT IS THE INDEPENDENT VARIABLE?

• Heart rate

• 6 minute time limit

• Time they are running

• The person

What is the factor that an experimenter changes on purpose?

• Dependent Variable
• Independent Variable
• Constant
• Control

Tags

NGSS.MS-PS2-2

A summary of the experiment that includes whether hypothesis was supported or not.

• Hypothesis

• Results

• Conclusion

• Independent Variable

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-4

What are all the things that are kept the same in an experiment?

• controls
• data
• constants
• independent variables

Students wanted to see if the type of material affected the temperature after being placed under a heat lamp for 10 minutes.

What is the dependent variable for this investigation?

• Type of material (rocks, sand etc)

• Temperature after 10 minutes

• Time under the lamp

• Heat lamp, amount of material

Tags

NGSS.MS-PS3-4

Students used various temperatures of water to see which one dissolved candy faster. 
What was the Independent Variable?

• Amount of Candy
• Amount of Water
• Temperature of Water
• Time for Candy to Dissolve

Tags

NGSS.MS-PS1-2

What is the effect of different levels of salt water on the the growth rate of grass?

What is the independent variable in the above question?

• salt water

• height

• average

• affect

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

I am doing a test to see if there is a connection between how long you run and how fast your heart beats. I will be performing an experiment where a person will run for a 1 minute and I will check their heartbeat. Then they will run for 2 minutes and I will check their heart rate. I will do this up to 6 minutes and see if there is a connection. WHAT IS THE INDEPENDENT VARIABLE?

• Heart rate

• 6 minute time limit

• Time they are running

• The person

Soccer season is here and I think I need to make sure I am healthy and I want to lose some weight. I keep seeing these commercials for Special K cereal and if you eat it for 2 weeks, you will lose 10 pounds. I want to test this idea and see if it actually works. I plan on eating whatever I want for the next two weeks and am going to track my weight every morning. Then I will eat nothing but Special K cereal, milk and water for two weeks and track my weight in the morning. WHAT IS THE DEPENDENT VARIABLE?

• My weight

• The cereal

• 10 lbs

• Eating whatever I want

A scientist is testing the impact of light and dark on the moth behavior by turning a light on and off. The DEPENDENT variable is...

• amount of light

• moth behavior/their reaction

• number of moths

• turning on and off

Tags

NGSS.MS-LS2-4