A medical doctor believes that the presence of aromatherapy candles will reduce the anxiety of first-time mothers-to-be during labor and will increase their reported satisfaction with their care at his hospital
He randomly assigns mothers to give birth in a room either with or without aromatherapy candles. What is the independent variable in this example?
A) anxiety level during labor
B) number of previous birthing experiences
C) room environment
D) satisfaction with hospital care
Answer: C
Rationale: In an experiment, the independent variable is the variable that the experimenter manipulates to distinguish between the different groups and the dependent variable is the variable which is measured and subsequently compared across all groups. The goal of an experiment is to determine if manipulating the independent variable affects the dependent variable. In this example, the goal is to determine if manipulating the room environment with candles will affect the two dependent variables: anxiety and satisfaction with care.
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