Science worksheet on identifying variables in experiments.

1.
- Dependent variable: Speed in solving long division problems
- Independent variable: Use of calculators (one group had calculators, the other didn’t)
- Control variable: The type of long division problems given to both groups

2.
- Dependent variable: Time taken to assemble the jigsaw puzzle
- Independent variable: Grade level of the students
- Control variable: The same jigsaw puzzle being used for all students

3.
- Dependent variable: Height of the bean plants after one week
- Independent variable: Type of liquid used (coca-cola, lemonade, water)
- Control variable: Amount of liquid given, type of beans, pot size, light, temperature, and time period

4.
- Dependent variable: Growth of Marigold plants
- Independent variable: Type of fertilizer used (Miracle Grow, Scotts Fertilizer, none)
- Control variable: Type of soil, amount of water, sunlight, pot size, and plant variety

5.
- Dependent variable: Grades on science work
- Independent variable: Number of apples eaten per day

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Explanation:

In scientific experiments, variables are categorized as follows:

- Dependent variable: What is being measured or observed (the outcome).
- Independent variable: What is deliberately changed or manipulated by the experimenter.
- Control variable: Factors that are kept constant so they don’t affect the outcome.

Each answer reflects these definitions based on the scenario described.