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# Writing if then hypothesis worksheet for middle school

The scientific method is a great critical thinking tool in the classroom. Learn how to create and implement a scientific method worksheet for a middle school class in this how-to video from About.com. Show transcript Hide transcript

Hello I’;m Milo for About.com and today we are talking about how to write a scientific method worksheet for middle school.

### How to Start a Scientific Method Activity

There are some specific steps to writing a scientific method worksheet when working with students as we are trying to get them to develop critical thinking skills. The first step is to come up with a question, a problem that needs to be tested out to be proven true or false.

Get the children to brainstorm and get them to formulate questions based on what they are able to observe around them. The goal is for them to learn to think critically and to learn to questions and not take things for granted. Go through the questions the kids have come up with and point out the difference between observations and inferences.

### Performing Research and Forumlating a Hypothesis

The second step is to get the class to do research about the topic.The students can use books, the Internet, ask the teacher, or interview people knowledgeable in the topic. Have the students keep a journal, writing down their search, both failures and success as well as their finds. In this journal you can make special emphasis on new vocabulary they make come across.

The third step is to formulate a hypothesis. During this step, we are getting the class to practice reasoning using the facts they have collected to re-formulate the question into a testable hypothesis.

### Conducting the Experiment

Finally, the experiment. Here you can make up an experiment for them or look through science books or the Internet to find one that is appropriate for your age group. Introduce the concepts of variables in the scientific method. Explain and make sure they understand what a controlled variable is VS an independent variable.

Make sure to allow a space on the worksheet for a list of materials. During the experiment, the students should keep track of what’;s happening in their journal as accurately as possible. They should understand that they are collecting data. This is a good place to introduce the concepts of quantitative and qualitative observation in research.

### InterpretinData and Writing the Conclusion

When the experiment is finished it is time for the conclusion. Here the data collected during the experiment is analyzed and it becomes apparent if the hypothesis was correct or not. Encourage the kids to use the new vocabulary they have learned in their paper and arrange for classroom presentations of each one of the projects.

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## What is a Hypothesis?

A hypothesis is a tentative, testable answer to a scientific question. Once a scientist has a scientific question she is interested in, the scientist reads up to find out what is already known on the topic.

Then she uses that information to form a tentative answer to her scientific question. Sometimes people refer to the tentative answer as “an educated guess.” Keep in mind, though, that the hypothesis also has to be testable since the next step is to do an experiment to determine whether or not the hypothesis is right!

A hypothesis leads to one or more predictions that can be tested by experimenting.

Predictions often take the shape of “If ____then ____” statements, but do not have to. Predictions should include both an independent variable (the factor you change in an experiment) and a dependent variable (the factor you observe or measure in an experiment). A single hypothesis can lead to multiple predictions, but generally, one or two predictions is enough to tackle for a science fair project.

## Examples of Hypotheses and Predictions

How does the size of a dog affect how much food it eats?

Larger animals of the same species expend more energy than smaller animals of the same type. To get the energy their bodies need, the larger animals eat more food.

If I let a 70-pound dog and a 30-pound dog eat as much food as they want, then the 70-pound dog will eat more than the 30-pound dog.

Does fertilizer make a plant grow bigger?

Plants need many types of nutrients to grow. Fertilizer adds those nutrients to the soil, thus allowing plants to grow more.

If I add fertilizer to the soil of some tomato seedlings, but not others, then the seedlings that got fertilizer will grow taller and have more leaves than the non-fertilized ones.

Does an electric motor turn faster if you increase the current?

Electric motors work because they have electromagnets inside them, which push/pull on permanent magnets and make the motor spin. As more current flows through the motor’s electromagnet, the strength of the magnetic field increases, thus turning the motor faster.

If I increase the current supplied to an electric motor, then the RPMs (revolutions per minute) of the motor will increase.

Is a classroom noisier when the teacher leaves the room?

Teachers have rules about when to talk in the classroom. If they leave the classroom, the students feel free to break the rules and talk more, making the room nosier.

If I measure the noise level in a classroom when a teacher is in it and when she leaves the room, then I will see that the noise level is higher when my teacher is not in my classroom.