Question

She wanted to find out if a fluorescent lightbulb generated less heat in a room than a standard lightbulb. She formed a hypothesis and planned out an experiment. She selected one standard lightbulb and one fluorescent lightbulb, making sure that both bulbs gave the same amount of light. Next, she put each lightbulb in a cardboard box (used to represent a room), taped the boxes shut, and measured the temperature change in each box after 30 minutes. She also measured the temperature change with no lightbulb. She repeated each step again to make sure her findings were the same the second time and recorded her measurements in the table below. After looking at the results, she was amazed at what a huge difference there was between the types of bulbs.
which would be the control group? I know the box with the fluorescent light is the experimental group.

Answer 1

The box with no lightbulb is the control group. The others are treatments. The purpose of a control group is used to increase the validity of the experiment by testing the independent variable to check that it does not influence the results.