John wants to conduct an experiment to determine why his bedroom is 1 point cooler in the morning than in the middle of the day. He set up an
experiment to measure the temperature in his room. Using the same
thermometer placed on the same table every day he measured the
temperature 3 times a day (8 am, noon and 9 pm) for 5 days. In his
hypothesis he predicted that the temperature would be higher in the
evening, because his room would be exposed to hours of sunshine by then.
Which of the following is the test variable (independent variable) in the
experiment above? *