Test Your Hypothesis by Doing an Experiment Analyze Your Data and Draw a Conclusion Communicate Your Results Following the scientific methodwe come up with a question that we want to answer, we do some initial research, and then before we set out to answer the question by performing an experiment and observing what happens, we first clearly identify what we "think" will happen. We make an "educated guess.
Print 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. A hypothesis leads to one or more predictions that can be tested by experimenting. 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 Question Prediction 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 pound dog and a pound dog eat as much food as they want, then the pound dog will eat more than the 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? 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.
What if My Hypothesis is Wrong? What happens if, at the end of your science project, you look at the data you have collected and you realize it does not support your hypothesis?Video: What is a Hypothesis? - Definition & Explanation The following examples will help you better understand how a good hypothesis should look.
Example 1. If people see funny commercials. A good hypothesis defines the variables in easy-to-measure terms, like who the participants are, what changes during the testing, and what the effect of the changes will be. (For more information about identifying variables, see: Variables in Your Science Fair Project.).
This is a good general hypothesis, but it gives no guide to how to design the research or experiment. The hypothesis must be refined to give a little direction. The hypothesis must be .
A good hypothesis has the following three characteristics: It is theoretically grounded: it is based upon literature relevant to the topic. It specifies the relationship between the values of two or more variables. For a hypothesis to be termed a scientific hypothesis, it has to be something that can be supported or refuted through carefully crafted experimentation or observation.
A scientific hypothesis . The 5 Components of a Good Hypothesis To make sure that your hypotheses can be supported or refuted by an experiment, you will want to include each of these elements: the change that you are testing.