Writing hypothesis | PDF - Free Printable
Educational worksheet: Writing hypothesis | PDF. Download and print for classroom or home learning activities.
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Step-by-step solution for: Writing hypothesis | PDF
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Show Answer Key & Explanations
Step-by-step solution for: Writing hypothesis | PDF
Let's solve each experiment step by step, identifying the independent variable (IV), dependent variable (DV), controls, and forming a hypothesis for each scenario. We'll use the correct scientific method format.
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Scenario:
Marge Simpson decided to start a new garden in her backyard. She bought a mixture of flower seeds and some potting soil. Then each of 5 plastic cups she put the same amount of soil. In the first cup she planted 2 seeds, in the second cup she planted 4 seeds, in the third cup 6 seeds, and in the fourth cup she planted 10 seeds. In the last cup she planted 32 seeds. After 20 days, she determined which set of plants looked best.
#### Step-by-step Analysis:
- Independent Variable (IV):
This is what Marge changed on purpose.
→ The number of seeds planted in each cup.
- Dependent Variable (DV):
This is what was measured or observed as a result.
→ How well the plants looked after 20 days (plant health/appearance).
- Controls:
These are the things that were kept the same across all cups to ensure a fair test.
→ Same type of soil, same amount of soil, same type of seeds, same size cups, same amount of time (20 days), same environmental conditions (light, water, etc., assumed unless stated otherwise).
- Hypothesis (If... then... because...):
→ *If* more seeds are planted in a cup, *then* the plants will look worse, *because* too many seeds may compete for space, nutrients, and light.
> ✔ Note: A better hypothesis might be:
> *If* the number of seeds increases, *then* plant health will decrease, *because* competition among seedlings reduces individual growth.
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Scenario:
Homer had read that a certain itching cream was the newest best thing on the market. It even claimed to cause 90% shorter lasting itching when used in combination with coffee. Intrigued by this product, he buys the itching powder and compares it to another product which contains dyes. He then rubs the product on his arm, applies the itching cream, and times how long it takes for the product to stop itching.
#### Step-by-step Analysis:
- Independent Variable (IV):
What Homer changed — the type of itching cream used.
→ One cream contains coffee, the other contains dyes.
- Dependent Variable (DV):
What was measured — how long it took for the itching to stop.
- Controls:
Things kept the same:
→ Same amount of itching powder applied, same location on the body (arm), same person (Homer), same method of application, same timing method, same environment.
- Hypothesis (If... then... because...):
→ *If* the itching cream contains coffee, *then* the itching will stop faster, *because* coffee may have properties that reduce irritation or speed up healing.
> ✔ Alternatively:
> *If* the cream with coffee is used, *then* the duration of itching will be shorter, *because* the product claims to reduce itching time by 90% when combined with coffee.
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Experiment #1:
- Independent Variable (IV): Number of seeds planted
- Dependent Variable (DV): How well the plants looked (plant health)
- Controls: Type and amount of soil, type of seeds, size of cups, time (20 days), environmental conditions
- Hypothesis: If more seeds are planted, then the plants will look worse because there will be more competition for resources.
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Experiment #2:
- Independent Variable (IV): Type of itching cream (coffee vs. dye-based)
- Dependent Variable (DV): Time it takes for itching to stop
- Controls: Amount of itching powder, location on the body, method of application, person, timing method
- Hypothesis: If the itching cream contains coffee, then the itching will stop faster because coffee may reduce irritation more effectively than dyes.
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Let me know if you'd like this formatted neatly for printing or submission!
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Experiment #1:
Scenario:
Marge Simpson decided to start a new garden in her backyard. She bought a mixture of flower seeds and some potting soil. Then each of 5 plastic cups she put the same amount of soil. In the first cup she planted 2 seeds, in the second cup she planted 4 seeds, in the third cup 6 seeds, and in the fourth cup she planted 10 seeds. In the last cup she planted 32 seeds. After 20 days, she determined which set of plants looked best.
#### Step-by-step Analysis:
- Independent Variable (IV):
This is what Marge changed on purpose.
→ The number of seeds planted in each cup.
- Dependent Variable (DV):
This is what was measured or observed as a result.
→ How well the plants looked after 20 days (plant health/appearance).
- Controls:
These are the things that were kept the same across all cups to ensure a fair test.
→ Same type of soil, same amount of soil, same type of seeds, same size cups, same amount of time (20 days), same environmental conditions (light, water, etc., assumed unless stated otherwise).
- Hypothesis (If... then... because...):
→ *If* more seeds are planted in a cup, *then* the plants will look worse, *because* too many seeds may compete for space, nutrients, and light.
> ✔ Note: A better hypothesis might be:
> *If* the number of seeds increases, *then* plant health will decrease, *because* competition among seedlings reduces individual growth.
---
Experiment #2:
Scenario:
Homer had read that a certain itching cream was the newest best thing on the market. It even claimed to cause 90% shorter lasting itching when used in combination with coffee. Intrigued by this product, he buys the itching powder and compares it to another product which contains dyes. He then rubs the product on his arm, applies the itching cream, and times how long it takes for the product to stop itching.
#### Step-by-step Analysis:
- Independent Variable (IV):
What Homer changed — the type of itching cream used.
→ One cream contains coffee, the other contains dyes.
- Dependent Variable (DV):
What was measured — how long it took for the itching to stop.
- Controls:
Things kept the same:
→ Same amount of itching powder applied, same location on the body (arm), same person (Homer), same method of application, same timing method, same environment.
- Hypothesis (If... then... because...):
→ *If* the itching cream contains coffee, *then* the itching will stop faster, *because* coffee may have properties that reduce irritation or speed up healing.
> ✔ Alternatively:
> *If* the cream with coffee is used, *then* the duration of itching will be shorter, *because* the product claims to reduce itching time by 90% when combined with coffee.
---
✔ Final Answers:
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Experiment #1:
- Independent Variable (IV): Number of seeds planted
- Dependent Variable (DV): How well the plants looked (plant health)
- Controls: Type and amount of soil, type of seeds, size of cups, time (20 days), environmental conditions
- Hypothesis: If more seeds are planted, then the plants will look worse because there will be more competition for resources.
---
Experiment #2:
- Independent Variable (IV): Type of itching cream (coffee vs. dye-based)
- Dependent Variable (DV): Time it takes for itching to stop
- Controls: Amount of itching powder, location on the body, method of application, person, timing method
- Hypothesis: If the itching cream contains coffee, then the itching will stop faster because coffee may reduce irritation more effectively than dyes.
---
Let me know if you'd like this formatted neatly for printing or submission!
Parent Tip: Review the logic above to help your child master the concept of writing hypothesis worksheet.
