# Using Your Hypothesis Writing Guide. Let’s use an example to illustrate how to us our guide! Suppose you were a farmer and you have been observing how.

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Let’s use an example to illustrate how to us our guide! Suppose you were a farmer and you have been observing how your tomato plants grow over the growing season. You really want to grow as many tomatoes that you can on each plant, so you want to find out what will give you the most tomatoes per plant! You want to do an experiment to determine what will give you lots of tomatoes! So you start a list of all the possible factors (“things”) that can affect how your tomato plants grow. Wondering: What will make tomato plants produce the most tomatoes per plant?

List all the possible variables for your wondering & experiment Amount of waterAmount of fertilizer Height of plantNumber of tomatoes Type of waterType of plant Type of soilWhen planted Amount of sunlightSize of leaves Color of leavesWhere planted

Now that you have the list, put a circle around the manipulated (changed) variable and underline the responding (measured) variable that you are going to test in the experiment Amount of fertilizer Height of plant Type of waterType of plant Type of soilWhen planted Number of tomatoesColor of leaves Amount of sunlightWhere planted Amount of water Manipulated (changed) Variable: amount of water given to plant Responding (measured) variable: amount of tomatoes produce per plant

Investigation question Will the amount of water a plant receives affect the amount of tomatoes a plant produces? Is this a testable question? How? Does it contain the manipulated and responding variable? Which is which? Is this experiment a cause and effect relationship?

Writing the hypothesis IF______________ Then ________________ Because ______________________________ Manipulated variable Responding Variable scientific reasoning for your prediction Important Hint: Did you state what change you are going to make to the manipulated variable? Examples Increase/decrease faster/slower More/less Hotter/colder Did you state how the responding variable will react to the manipulated variable? The Hypothesis: If the water a plant receives is increased Then the amount of tomatoes produced will increase Because all plants need water to grow and produce fruit.

Let’s try and write some hypothesizes/predictions for some investigation questions! We will score them on a 3 point rubric

Manipulated variable Did you state how it will be changed? Responding variable How it will respond

Wondering: Does the amount of sleep an athlete gets the night before a game affect their performance? Observation: You notice that when the members of the football team stay out after 9:00 on a game night, they lose the next day. They fumble, miss tackles, and throw interceptions. Let’s start with the variables: M.V.____________________ R.V._____________________ Amount of sleep an athlete gets the night before a game Game performance…less fumbles, more tackles, less interceptions

Analyze this hypothesis—what do you think? Any problems? If the amount of exercise changes Then the exam scores of the student will also change because by changing the amount of exercise your heart will beat faster and provide your brain with more blood, thus giving you more energy.

Solution If the amount of exercise changes (LAME!) If the amount of exercise increases then the exam scores of the student will also change (LAMER!) Then the exam scores of student will increase by over 50% because by increasing the amount of exercise your heart will beat faster and provide your brain with more blood, thus giving you more energy.

Inquiry Question: Does the depth of a lake affect the population of fish that live there? Identify: Manipulated Variable : Responding Variable : Depth of lake Population of fish Population: The number of a species living in a defined area

What do you think? If the depth of a lake increases THEN the number of fish in the lake will increase BECAUSE in a deep lake fish will have more areas to hide from predators like eagles and otters. A deeper lake will also have more food available than a shallow lake.

1. What effect does studying with music have on student test scores? What is the manipulated variable? Studying with or without music What is the responding variable? Test Score Write a hypothesis: IF ___________ then _________ because ______________

Example of hypothesis If students listen to music while studying Then their test grades will increase Because the music will relax their brains and they will be able to concentrate better

What effect does food color have on the amount of food fish eat? Manipulated Variable: Different Food colors Responding Variable: Amount of Fish

Hypothesis Example If fish food is very colorful Then fish will eat a greater amount Because they will be able to see eat it better even in murky water

What effect does smiling have on the teacher giving no homework? Manipulated Variable: Smiling or not smiling Responding Variable: Homework or No Homework

Hypothesis Example If students smile more in class Then the teacher will give more homework Because they see how much we adore the challenging work we do in class and just want the work to never end!

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