Why is it important that an experiment include a control group?
A) The control group is the group that the reseacher is in control of; it is the group in which the researcher predetermines the nature of the results.
B) The control group provides a reserve of experimental subjects.
C) A control group is required for the development of an "if; then" statement.
D) A control group assures that an experiment will be repeatable.
E) Without a control group, there is no basis for knowing if a particular result is due to the variable being tested or to some other factor.
This young child is pulling at the ear and acting fussy, two important signs of otitis media.
The Redi experiment.
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Negative feedback control of a regulated variable.
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Results of disrupted control of skeletal muscles