RESEARCH METHODS THINKING CRITICALLY WITH PSYCHOLOGICAL SCIENCE
EXPERIMENTAL VARIABLES IN PSYCHOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Type of plant, amount of music, and sunlight
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Water, apple juice, milk
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Plant growth
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None of the above
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Detailed explanation-1: -In this investigation, the independent variable is represented by the different liquids (Option C). The independent variable is the variable that isn’t changed by the other variables during the experimental procedure.
Detailed explanation-2: -When you try to grow plants using another liquid, the molecules (or what makes up that liquid) are shaped differently from water molecules. Because of their different shape, they block the process of photosynthesis from occurring, so the seeds do not know they should grow!
Detailed explanation-3: -In this experiment, the addition of fertilizer is the independent variable manipulated by the scientist. Plant height is the dependent variable that responds to the change in the independent variable. Each plant is exposed to an equal amount of sunlight, so sunlight is the control variable.
Detailed explanation-4: -In a study measuring the influence of different quantities of fertilizer on plant growth, the independent variable would be the amount of fertilizer used. The dependent variable would be the growth in height or mass of the plant.
Detailed explanation-5: -Controlled variable(s): quantity of water, type of soil, depth of seeds, source of light, concentration/type of fertilizer (if any); temperature of the room, etc. Controlled variable(s): Same type of seeds, same quantity of water, same type of soil, same source of light, same duration of light, etc.