Scientific Variables

Question #2: A bug repellant is sprayed on one arm and the other is not sprayed. The number of bug bites is recorded after 2 hours. What is the independent variable?

• How much the bites itch

• Bug repellant

• Number of bug bites

Question #2: A bug repellant is sprayed on one arm and the other is not sprayed. The number of bug bites is recorded after 2 hours. What is the dependent variable?

• How much the bites itch

• Bug repellant

• Number of bug bites

Question #3: Javier sleeps 9 hours the night before his science exam. His twin sister has the same exam and sleeps 6 hours the night before the test. Afterwards, they compare their scores. What is the independent variable?

• Amount of sleep

• Test score

• Twin sister

Question #3: Javier sleeps 9 hours the night before his science exam. His twin sister has the same exam and sleeps 6 hours the night before the test. Afterwards, they compare their scores. What is the dependent variable?

• Amount of sleep

• Test score

• Twin sister

Question #4: Group A exercises for a month. Group B does not exercise. They measure the amount of weight they gained. What is the independent variable?

• Amount of weight gain

• Amount of exercise

• What they wear while exercising

Question #4: Group A exercises for a month. Group B does not exercise. They measure the amount of weight they gained. What is the dependent variable?

• Amount of weight gain

• Amount of exercise

• What they wear while exercising

Question #4: What is the control in this experiment?

• Group A

• Group B

• Amount of exercise

• Amount of weight gain

Question #5: One math class studies for an assessment while the math class next door does not. The scores of the two classes are compared. What is the independent variable?

• What the students ate

• Amount of studying

• Test scores

Question #5: One math class studies for an assessment while the math class next door does not. The scores of the two classes are compared. What is the dependent variable?

• What the students ate

• Amount of studying

• Test scores

Question #5: What should be a constant in this experiment?

• What the students ate

• Amount of studying

• Test scores