Answer: C) She didn't randomly assign participants to the experimental and control groups.
Explanation: It is necessary to randomly assign people to hot or cool units becasue if you give people a choice, they will automatically select the room with the temperature they prefer which would overthrow the point of the experiment.
Hope this helps! :)
Answer:
In 1905 , Russians marched to Saint Petersburg to demand reforms, but soldiers fired on the crowd. This event is called Bloody Sunday.
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