Erin is researching how much people sleep. She finds that participants who sleep in an east-facing room sleep less than those in rooms facing north, west, or south. This held true whether or not participants had the shades drawn. Which is the correct labeling of the variables?
A. IV--room direction, shades; DV--amount of sleep
B. IV--amount of sleep; DV--room direction, shades
C. IV--room direction; DV--amount of sleep; secondary variable--shades
D. IV--amount of sleep; DV--room direction; secondary variable--shades
A. IV--room direction, shades; DV--amount of sleep
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