Control group
Explanation:
Experiments are usually designed so that the differences between the experiment and control groups can be observed.
- The experimental group is the group that follows the details of the hypothesis where variables are changed to see their causes and effects.
- The control group is the standard by which the experimental group is compared with.
- The variables are being tested for in the experimental group to see how they are changing .
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Answer:
The fourth plant that receives pure water is the control group.
Explanation:
The election of a control group is essential in an experiment. Its principal purpose is to allow the discrimination of the results obtained by the treatment in the study, in this case, <em>the different concentrations of salty water that each plant receives</em>. The control group provides a reference point. It must be selected from the same population of the treatment groups. Both groups must be similar in every variable that might influence the results, <u>except for the study treatment.</u>
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Since the air is a great thermal isolator, the windows prevent heat exchange better than one made out of a single thick sheet of glass. The air between the thin blankets is not moving around and will form an isolating layer that acts exactly like another blanket, thus improving the thermal isolation
