It depends what kind of experiment you do. For some you just need one. For others you may change two variables. In most cases you only change one
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There are 3 different variable. The independent variable is what you will be changing in the experiment and there should only be one. The dependent variable is what you will be measuring or observing. The controlled variable is what you will be keeping the same and there can be more than one. There is no limit on how many controlled variables you can have.
1.) List the needed materials. 2.) Plan the variables. 3.) List the procedures.
In an experiment containing a number of possible variables only one of these should be altered in each individual experiment. Otherwise it is not possible to determine which variable is responsible for a particular change.
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Independent variables are those that you change in an experiment. Dependent variables are the ones that you measure in an experiment. Dependent variables are influenced by the independent variables that you change, so they are dependent upon the independent variable. Generally, experiments should have only one independent variable.
To start a hypothesis for a scientific experiment, you need to make an educated guess about the relationship between two variables. This guess should be based on prior knowledge or observations.
A experiment should only have one variable.
There are 3 different variable. The independent variable is what you will be changing in the experiment and there should only be one. The dependent variable is what you will be measuring or observing. The controlled variable is what you will be keeping the same and there can be more than one. There is no limit on how many controlled variables you can have.
1.) List the needed materials. 2.) Plan the variables. 3.) List the procedures.
To eliminate confounding variables, or variables that were not controlled and damaged the validity of the experiment by affecting the dependent and independent variable, the experimenter should plan ahead. They should run many checks before actually running an experiment.
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To formulate a hypothesis for a scientific experiment, start by identifying the problem or question you want to investigate. Then, make an educated guess about the possible outcome of the experiment based on existing knowledge or observations. Your hypothesis should be testable, specific, and clear, stating the relationship between the variables you are studying.