Teacher:Write a phrase, the answer to which is present in the passage. The answer to this question should be completely and unambiguously found in the passage. The query must be about a single or multiple linked entities. 
Teacher: Now, understand the problem? Solve this instance: Variables and Hypothesis Variables Scientists use an experiment to search for cause and effect relationships in nature. In other words, they design an experiment so that changes to one item cause something else to vary in a predictable way. For example, if you open a faucet. (the independent variable), the quantity of water flowing (dependent variable) changes in response--the water flow increases. The number of dependent variables in an experiment varies, but there is often more than one. Experiments also have controlled variables. Examples. 1  A researcher wants to determine if the color of an office has any effect on worker productivity. In an experiment, one group performs a task in a yellow room while another performs the same task in a blue room. In this example, the color of the office is the independent variable. Researchers want to learn whether listening to fast-paced music helps runners perform better during a marathon. In an experiment, one group of runners listens to fast-paced music while another group listens to slow-paced music. The independent variable is the one the scientist changes during an expert, while the dependent variable is the one the scientist measures to determine the results of the experiment. Controlled variables are ones that could potentially affect the experiment, and the scientist keeps them the same to make the experiment fair. Independent Variable. The variable that the scientist changes during the experiment is the independent variable. Think of the experiment as a cause and effect exercise. The independent variable is the cause factor. For example, to test the hypothesis that a seed needs light to germinate, the independent variable would be whether the seed was left exposed to light or covered with soil. If you hypothesize that Cub Scout pinewood derby cars are faster when the weight is near the rear, the placement of the weight is the independent variable. These changing quantities are called variables, and an experiment usually has three kinds: independent, dependent, and controlled. The independent variable is the one that is changed by the scientist. In an experiment there is only one independent variable. As the scientist changes the independent variable, he or she observes what happens. The dependent variable changes in response to the change the scientist makes to the independent variable. The new value of the dependent variable is caused by and depends on the value of the independent variable. (the independent variable), the quantity of water flowing (dependent variable) changes in response--the water flow increases. The number of dependent variables in an experiment varies, but there is often more than one. The independent variable is the one the scientist changes during an expert, while the dependent variable is the one the scientist measures to determine the results of the experiment. The independent variable is the one the scientist changes during an expert, ... Answer: An independent variable is exactly what it sounds like. It is a variable that stands alone and isn't changed by the other variables you are trying to measure. For example, someone's age might be an independent variable. Other factors (such as what they eat, how much they go to school, how much television they watch) aren't going to change a person's age. Many people have trouble remembering which is the independent variable and which is the dependent variable. An easy way to remember is to insert the names of the two variables you are using in this sentence in they way that makes the most sense. The hypothesis is worded so that it can be tested in your experiment. Do this by expressing the hypothesis using your. independent variable (the variable you change during your experiment) and your dependent variable (the variable that. changes in response and depends on changes in the independent variable).
Student:
during an experiment what is a independent variable