Let's go through each scenario and identify the
Independent Variable (IV) and
Dependent Variable (DV).
Definitions:
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Independent Variable (IV): The variable that is deliberately changed or manipulated by the researcher.
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Dependent Variable (DV): The outcome or response that is measured to see how it is affected by the IV.
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1.
Justin wants to determine the effect of fertilizer on the growth of grass.
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IV: Type or amount of fertilizer
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DV: Growth of grass
2.
Randell wants to determine if salinity has an effect on his goldfish.
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IV: Salinity (salt concentration in water)
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DV: Health, behavior, or survival of goldfish (any measurable effect on the fish)
3.
James wants to know the effect of studying an extra 10 minutes each day on his Biology grade.
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IV: Amount of time spent studying (extra 10 minutes per day)
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DV: Biology grade
4.
Joelle wants to determine the effect of pesticides on the size of the apples in the orchard.
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IV: Use or type of pesticide
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DV: Size of apples
5.
Billy wants to know if increasing his exercise will decrease the time it takes him to run a kilometer.
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IV: Amount of exercise
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DV: Time to run a kilometer
6.
Angel wants to know if the type of detergent has an effect on the cleanliness of her clothes.
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IV: Type of detergent
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DV: Cleanliness of clothes
7.
Madison wants to determine if the weight of the dog will have an effect on the number of puppies in the litter.
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IV: Weight of the dog
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DV: Number of puppies in the litter
8.
Zack wants to determine if the amount of time spent on social media has an effect on anxiety levels.
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IV: Amount of time spent on social media
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DV: Anxiety levels
9.
Coomer wants to determine if the diet of a rat has an effect on the rat’s overall health (weight, bone density).
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IV: Diet of the rat
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DV: Overall health (weight, bone density)
10.
Allison wants to determine if the deer population in the area is influenced by the coyote population.
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IV: Coyote population
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DV: Deer population
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Final Answers:
1. IV: Fertilizer | DV: Growth of grass
2. IV: Salinity | DV: Goldfish (health/behavior)
3. IV: Study time | DV: Biology grade
4. IV: Pesticides | DV: Size of apples
5. IV: Exercise | DV: Time to run a kilometer
6. IV: Type of detergent | DV: Cleanliness of clothes
7. IV: Weight of the dog | DV: Number of puppies
8. IV: Time spent on social media | DV: Anxiety levels
9. IV: Diet of rat | DV: Overall health (weight, bone density)
10. IV: Coyote population | DV: Deer population
✔ These are all correctly identified based on cause-and-effect relationships.
Parent Tip: Review the logic above to help your child master the concept of independent variable vs dependent variable worksheet.
