Experimental Design

Sponge Bob notices that his pets Gary and Sally are suffering from slimotosis, which occurs when the shell develops a nasty slime and gives off a horrible odor.

His friend Patrick tells him that rubbing seaweed on the shell is the perfect cure.

Sponge Bob decides to test this cure by rubbing Gary with seaweed for 1 week; he leaves Sally's shell as it is. After a week of treatment, the slime is gone and Gary’s shell smells better.

What is the independent variable?

• Seaweed treatment

• Sally

• Shell odor

• Gary

Sponge Bob notices that his pets Gary and Sally are suffering from slimotosis, which occurs when the shell develops a nasty slime and gives off a horrible odor.

His friend Patrick tells him that rubbing seaweed on the shell is the perfect cure.

Sponge Bob decides to test this cure by rubbing Gary with seaweed for 1 week; he leaves Sally's shell as it is. After a week of treatment, the slime is gone and Gary’s shell smells better.

What is the dependent variable?

• Seaweed treatment

• Sally

• Shell odor

• Gary

Sponge Bob notices that his pets Gary and Sally are suffering from slimotosis, which occurs when the shell develops a nasty slime and gives off a horrible odor.

His friend Patrick tells him that rubbing seaweed on the shell is the perfect cure.

Sponge Bob decides to test this cure by rubbing Gary with seaweed for 1 week; he leaves Sally's shell as it is. After a week of treatment, the slime is gone and Gary’s shell smells better.

What is the control group?

• Seaweed treatment

• Sally

• Shell odor

• Gary

SpongeBob noticed that his favorite pants were not as clean as they used to be. His friend Sandy told him that he should try using Clean-O detergent, a new brand of laundry soap she found at Sail-Mart.

SpongeBob made sure to wash one pair of pants in plain water and another pair in water with the Clean-O detergent.

After washing both pairs of pants a total of three times, the pants washed in the Clean-O detergent did not appear to be any cleaner than the pants washed in plain water.

What is the independent variable?

• Type of detergent

• Pair of pants washed in plain water

• Pair of pants washed in Clean-O

• Cleanliness of the pants

SpongeBob noticed that his favorite pants were not as clean as they used to be. His friend Sandy told him that he should try using Clean-O detergent, a new brand of laundry soap she found at Sail-Mart.

SpongeBob made sure to wash one pair of pants in plain water and another pair in water with the Clean-O detergent.

After washing both pairs of pants a total of three times, the pants washed in the Clean-O detergent did not appear to be any cleaner than the pants washed in plain water.

What is the dependent variable?

• Type of detergent

• Pair of pants washed in plain water

• Pair of pants washed in Clean-O

• Cleanliness of the pants

SpongeBob noticed that his favorite pants were not as clean as they used to be. His friend Sandy told him that he should try using Clean-O detergent, a new brand of laundry soap she found at Sail-Mart.

SpongeBob made sure to wash one pair of pants in plain water and another pair in water with the Clean-O detergent.

After washing both pairs of pants a total of three times, the pants washed in the Clean-O detergent did not appear to be any cleaner than the pants washed in plain water.

What is the control group?

• Type of detergent

• Pair of pants washed in plain water

• Pair of pants washed in Clean-O

• Cleanliness of the pants

What is a factor that is measured for change in an experiment?

• control
• constant
• independent variable
• dependent variable

What is the factor that an experimenter changes on purpose?

• Dependent Variable
• Independent Variable
• Constant
• Control

The part of the experiment that does not contain the independent variable. Used for comparison.

• Control Group
• Experimental Group
• Results
• Data

Tags

CCSS.HSS.IC.B.3

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

• controls
• data
• constants
• independent variables

Tags

CCSS.HSS.IC.B.3