Independent Dependent Control Variables

A bug repellent was sprayed on one arm. On the other arm, the bug repellent was not sprayed. After 2 hours, the number of bug bites are recorded. What is the independent variable?

• The type of bug repellent

• If an arm was sprayed with bug repellent or not

• The number of bug bites

Tags

NGSS.MS-PS1-2

A bug repellent was sprayed on one arm. On the other arm, the bug repellent was not sprayed. After 2 hours, the number of bug bites are recorded. What is the dependent variable?

• The type of bug repellent

• If an arm was sprayed with bug repellent or not

• The number of bug bites

Javier and his twin sister both have the same science exam. Javier sleeps for 9 hours the night before the exam and his sister sleeps for 6 hours. After they take the test, they both compare their test grades. What is the independent variable?

• The number of hours of sleep they had

• The type of test

• The test grades

Javier and his twin sister both have the same science exam. Javier sleeps for 9 hours the night before the exam and his sister sleeps for 6 hours. After they take the test, they both compare their test grades. What is the dependent variable?

• The test grades

• The number of hours of sleep they had

• The type of test

Group A decides to exercise for a month. Group B decides not to exercise during the same month. Afterward, they measure the amount of weight that each group lost. what is the independent variable?

• How much weight each group lost

• The type of exercise

• If group exercises or not

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

Group A decides to exercise for a month. Group B decides not to exercise during the same month. Afterward, they measure the amount of weight that each group lost. what is the dependent variable?

• If a group exercises or not

• How much weight each group lost

• The type of exercise

Ben makes five paper helicopters with different wing lengths. He drops them the same way from a height of two meters for five trials each. He records the amount of time it takes for each helicopter to fall to the ground.

What is the independent variable?

• Dropping the same way

• Wing Length

• Amount of time it takes the helicopter to hit the floor

• Dropping from the same height

Tags

NGSS.MS-PS2-2

Ben makes five paper helicopters with different wing lengths. He drops them the same way from a height of two meters for five trials each. He records the amount of time it takes for each helicopter to fall to the ground.

What is the dependent variable?

• Dropping the same way

• Wing Length

• Amount of time it takes the helicopter to hit the floor

• Dropping from the same height

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

If I drink a little water then I will have to go to the bathroom.

Identify the type of variable highlighted in red.

• Independent variable

• dependent variable

When experimenting with the growth of a plant, a scientist uses three (of the same type of) plants, two different fertilizers, equal light, and equal water. What type of variable is the fertilizer?

• Dependent

• Independent

• Control

• Compound