Researchers studying the effects of sleep deprivation tested the physical coordination skills of 25-year-old males who had been sleep deprived for 24, 36, or 48 hours. In this study, the dependent variable would be the
A) age of the research participants.
B) physical coordination skills of the men in the study.
C) length of time the participants had been sleep deprived.
D) type of physical coordination task the researchers use.
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