Which setup is the control

A control setup uses all the same equipment under the same conditions, but no variables are tested, and it provides a baseline with which to compare the results of the experiment setup.

A scientific experiment has several parts, including the independent variable, dependent variable, the control and the levels of independent variable. Other elements include repeated trials and constants. Control groups are further separated into two forms: positive and negative control groups. Positive control groups are groups in which the conditions of the experiment are put up to guarantee a positive outcome. You can not make changes once you have begun, even if the results you are getting do not seem to support your original hypothesis.

When you change your hypothesis, you change the entire experiment and you must begin again. Do not be upset if your results are not what you expect. Some of the greatest scientific advances have come from experiments that disproved the original hypothesis. Start over again with a new hypothesis or find new variables to manipulate. Scientific advancement is a painstakingly slow process and scientists often spend years and even an entire lifetime working on the same problem.

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To submit your questions or ideas, or to simply learn more, see our about us page: link below. Updated July 21, How to Calculate a P-Value. How to Check Multiplication. The Definition of an Uncontrolled Variable. What Is a Positive Control in Microbiology? At the end of the experiment , you compare the data from both groups to see if your hypothesis was correct or not.

Ultimately, the control set-up is in place to ensure that the measured variable dependent variable is affected only by the changed variable independent variable and not any other variable in the experiment.

In scientific experiments, a scientific control is one in which the subject or a group would not be tested for the dependent variable s. A biological control is the use of organism s to control the population of another group of organisms.

A control is important for an experiment because it allows the experiment to minimize the changes in all other variables except the one being tested. Control is a function of management which helps to check errors in order to take corrective actions. Control in management includes setting standards, measuring actual performance and taking corrective action the decision making.

Control and experimental groups There are two groups in the experiment , and they are identical except that one receives a treatment water while the other does not. In general, a controlled experiment must always have a control group as a baseline. A negative control is a control group in an experiment that uses a treatment that isn't expected to produce results. A positive control is a control group in an experiment that uses a treatment that is known to produce results.

Examples of Controlled Variables Temperature is a common type of controlled variable. If a temperature is held constant during an experiment, it is controlled. Other examples of controlled variables could be an amount of light, using the same type of glassware, constant humidity, or duration of an experiment. The definition of control is power to direct, or an accepted comparison model in an experiment, or a device used for regulation.

An example of control is someone knowing exactly where everything is located in their house. An example of a control is a chemical drug used in a urine drug testing lab. A simple example of a control group can be seen in an experiment in which the researcher tests whether or not a new fertilizer has an effect on plant growth. The negative control group would be the set of plants grown without the fertilizer, but under the exact same conditions as the experimental group.

Doing a Fair Test. It is important for an experiment to be a fair test. You conduct a fair test by making sure that you change one factor at a time while keeping all other conditions the same. For example, let's imagine that we want to measure which is the fastest toy car to coast down a sloping ramp.

A control variable or scientific constant in scientific experimentation is an experimental element which is constant and unchanged throughout the course of the investigation.