GK
GENERAL SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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there are at least two variables
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a control group is compared with one or more experimental groups
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a variable is not needed
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should only be conducted one time
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Detailed explanation-1: -A control group is used as a comparison for the experimental group. The control group is the group in an experiment that does not receive any change in the variable. This group is left as natural as possible and used as a control to see if there is a change from the normal results.
Detailed explanation-2: -In a controlled experiment, all extraneous variables are held constant so that they can’t influence the results. Controlled experiments require: A control group that receives a standard treatment, a fake treatment, or no treatment.
Detailed explanation-3: -The possibility of using more than one control group has often been briefly mentioned in general discussions of observational studies, and many observational studies have used two control groups.