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❶Begin typing the name of a book or author: There are two main types of control, positive and negative, both providing researchers with ways of increasing the statistical validity of their data.

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Explaining the Control in a Science Experiment
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Harm to minors, violence or threats, harassment or privacy invasion, impersonation or misrepresentation, fraud or phishing, show more. Paper Towel Absorption Experiment. The question cannot accurately be answered with the information you have provided.

I completely disagree with the answer that the control is the towel you "focus on. This experiment needs NO control. You simply measure how much a towel absorbs, or how fast it absorbs. Imagine the question, "Which car is faster, Mustang or Camero? How soon can each car go around a three mile road course? The answer to each of these questions may result in a different car being named the "fastest.

For instance, how fast do the vehicles go from zero to sixty. You run several races, different times of day, road conditions, using multiple stop watches, different drivers,etc.

You log the results. The only thing constant is that the time logged is at the point the cars reach sixty mph. THIS is the control. For your towel experiment, you may choose a time factor, as well. In addition to the placebo effect, the Hawthorne Effect is another phenomenon where, if people know that they are the subjects of an experiment, they automatically change their behavior.

Researchers sometimes design ingenious ways to get around this, usually by telling participants they are testing for one thing while actually testing for another. This can be a very clever approach, as long as care is given to the ethics of the study first. In the social sciences, control groups are an especially important part of the experiment , because it often very difficult to eliminate all of the confounding variables and bias. There are two main types of control, positive and negative, both providing researchers with ways of increasing the statistical validity of their data.

A positive scientific control group is a control group that is expected to have a positive result. By using a treatment that is already known to produce an effect, the researcher can compare the test results with the positive control and see whether the results can match the effect of the treatment known to work..

For example, a researcher testing the effect of new antibiotics on Petri dishes of bacteria, may use an established antibiotic that is known to work as the control. However, if the control fails too, there may be something wrong with the design. Positive scientific control groups reduce the chances of false negatives. In a negative scientific control group, no result is expected. In this case, the control group ensures that no confounding variable or bias has affected the results.

In the same antibiotic example, the negative control group would be a Petri dish of bacteria with no antibiotic of any kind added. The results of the control and the experimental group are then compared. If all new antibiotic inhibited the bacteria, but the negative control group also did, then some other variable may have had an effect, confounding the results.

Finally, control groups can be sued to establish a baseline. For example, a researcher testing the radioactivity levels of various samples with a Geiger counter would also sample the background level, allowing them to adjust the results accordingly.

The background level serves as a control. Establishing strong scientific control groups is arguably a more important part of any scientific design than the actual samples. Failure to provide sufficient evidence of strong control groups can completely undermine a study, however high significance-levels indicate low probability of error. Check out our quiz-page with tests about:.

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Science Homework Help What Is A Control Group. science Political Parties and Interest Groups AP US Government AP US Government VideosSometimes, that control arm stands on its own ground only depending on the available data based on current trials. Science homework help!? More questions. I need help with my science homework?A control group in a scientific experiment is a group separated from the rest of the experiment where the independent variable being tested cannot influence the results.

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Control Independent and Dependent Variable Worksheet Science Homework Help What Is A Control Group websites help research Jo Palladino, Ph.D, clinical psychologist and author of Dreamers, Discoverers, and Dynamos: How to Help the Child . Feb 28,  · You will find it in detail in the Concurrent control group Homework Help. Feedback control: This type of concurrent control puts the focus on the outputs of the organization after the transformation is done completely/5().