1. Scientific Method: Writing Hypotheses
Learning Target :
I understand that a hypothesis is a prediction of the outcome of the experiment.
I know that  a scientific hypothesis is written using  the “IF/THEN” format.

2. Scientific Hypothesis
A hypothesis is a prediction of the outcome of the experiment.
A hypothesis is based on research done on the topic of your question.
A good hypothesis is written in the “If/Then” format.
This format shows a cause and effect relationship between the independent and dependent variables.

3. “If/Then” Hypothesis
When writing an “If/Then” hypothesis it should be modeled as such;
If (describe a specific change made to the IV)
Then (Describe what you think will happen to the DV)

4. Example
Question: Which type of soil makes a tomato plant grow taller, sand or soil?
IV: Type of Soil DV: Tomato Plant Height
Hypothesis:
If a tomato plant is planted in soil then it will grow taller.

5. Writing a Hypothesis Examples
Question: What is the effect of the number of books I read on my reading speed?
IV: The number of books I read
DV: Reading Speed
Hypothesis:
If I increase the number of books I read
Then my reading speed will increase.

6. Writing a Hypothesis Examples
Question: What is the effect of the amount of light on plant growth?
IV: Amount of Light
DV: Plant Growth
Hypothesis:
If a plant is given more light
Then it will grow taller.

7. Writing a Hypothesis Examples
Question: What is the effect of the type movie on heart rate?
IV: Type of Movie
DV: Heart Rate
Hypothesis:
If I watch a horror movie
Then my heart rate will increase.

8. Writing a Hypothesis Examples
Question: How does temperature affect the rate of water evaporation?
IV: Temperature
DV: Rate of Water Evaporation
Hypothesis:
If the temperature increases
Then water will evaporate faster.

9. Writing a Hypothesis Examples
Question: What is the effect of energy drinks on a persons heart rate?
IV: Energy Drink
DV: Persons Heart Rate
Hypothesis:
If I drink an energy drink
Then my heart rate will increase.

10. Writing a Hypothesis Practice
Question: How does the time of year affect soy plant growth?
IV: Time of Year
DV: Soy Plant Growth
Hypothesis:
If the time of year is summer
Then the soy plant will grow taller.

11. Writing a Hypothesis Practice
Question: What is the effect of the color of light on a plants growth?
IV: Color of Light
DV: Plant Growth
Hypothesis:
If a plant is grown under a green light
Then its growth will increase.

12. Writing a Hypothesis Practice
Question: What is the effect of an items weight on how fast it falls when dropped?
IV: Items weight
DV: Speed at which it falls
Hypothesis:
If the weight of an item increases
Then it will fall at the same speed.

13. Writing a Hypothesis Practice
Question: How does the type of cup affect the temperature of the liquid in it?
IV: Type of cup
DV: Temperature of the liquid
Hypothesis:
If a hot liquid is poured into a coffee mug
Then its temperature will stay hot longer.

14. Writing a Hypothesis Practice
Question: How does the type of show affect running speed?
IV: Type of Shoe
DV: Running Speed
Hypothesis:
If I wear running shoes
Then my running speed will increase.

15. Writing a Hypothesis Practice
Question: What is the effect of the amount of salt on the boiling rate of water?
IV: amount of salt
DV: boiling rate of water
Hypothesis:
If the amount of salt added to water is increased
Then it will boil faster.

16. Writing a Hypothesis Practice
Question: How does the type of soil affect a plants height?
IV: Type of Soil
DV: Plant Height
Hypothesis:
If a plant is grown in fertilized soil
Then it will grow taller.

17. Writing a Hypothesis Practice
Question: How does the type of food affect the rate of mold growth?
IV: type of food
DV: rate of mold growth
Hypothesis:
If organic bread is left out
Then it will grow mold faster.

18. Writing a Hypothesis Practice
Question: What is the effect of scary movies on heart rate?
IV: Type of Movie
DV: Heart Rate
Hypothesis:
If I watch a scary movie
Then my heart rate will increase.

19. Writing a Hypothesis Practice
Question: What is the effect of the type of food eaten for breakfast on a persons energy level?
IV: Type of Breakfast food
DV: Persons Energy Level
Hypothesis:
If I eat a healthy vegetable omelet for breakfast
Then my energy level will increase.