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First, note the time and date. Next, write a brief description of what you were doing. Continuing with the gum example, a sample project log entry might read, “Jan. 10, 2011, 12 p.m.: Gathered gum samples for project and worked out rough procedure overview for testing each piece.”.
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A variable is any factor, trait, or condition that can exist in differing amounts or types. An experiment usually has three kinds of variables: independent, dependent, and controlled. The independent variable is the one that is changed by the scientist. To insure a fair test, a good experiment has only one independent variable.
- What Is An Independent variable?
- What Is A Dependent variable?
- What Is A Control variable?
The independent variable is the onethat is changed by the scientist. Why just one? Well, if you changed more than one variable it would be hard to figure out which change is causing what you observe. For example, what if our scientific question was: "How does the size of a dog affect how much food it eats?"; then, during your feeding experiments yo...
The dependent variablesare the things that the scientist focuses his or her observations on to see how they respond to the change made to the independent variable. In our dog example, the dependent variable is how much the dogs eat. This is what we are observing and measuring. It is called the "dependent" variable because we are trying to figure ou...
Experiments also have controlled variables. Controlled variables are quantities that a scientist wants to remain constant, and she or he must observe them as carefully as the dependent variables. For example, in the dog experiment example, you would need to control how hungry the dogs are at the start of the experiment, the type of food you are fee...
- Anne Marie Helmenstine, Ph.D.
- Experiment or Investigation. This is the most common type of science project, where you use the scientific method to propose and test a hypothesis. After you accept or reject the hypothesis, you draw conclusions about what you observed.
- Demonstration. A demonstration usually involves re-testing an experiment that already has been done by someone else. You can get ideas for this type of project from books and on the internet.
- Research. In this science project, you collect information about a certain topic and present your findings. Example: A research project can be an excellent project if you use the data to answer a question.
- Model. This type of science project involves building a model to illustrate a concept or principle. Example: Yes, one example of a model is the vinegar & baking soda volcano, but you can have an incredible high school or college project by building a model of a new design or a prototype for an invention.
Feb 4, 2019 · Propose a Testable Hypothesis. The hardest part of experimental design may be the first step, which is deciding what to test and proposing a hypothesis you can use to build an experiment. You could state the hypothesis as an if-then statement. Example: "If plants are not given light, then they will not grow."
- Anne Marie Helmenstine, Ph.D.
In science, a variable is anything that can change or be different. It can be a thing (like a shirt or a jacket), a characteristic (like rough or smooth), or a situation (like sunny or cloudy). Scientists want to know how things work. They want to understand why things happen and use that information to predict what will happen in the future.
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Mar 4, 2022 · Independent Variables. The independent variable, also known as the experimental treatment, is the difference or change in the experimental conditions that is chosen by the scientist (the cause). To ensure a fair test, a good experimental inquiry only has one independent variable and that variable should be something that can be measured ...
