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Design an Experiment
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Okay – this is one of the hardest things for a lot of students who are not science majors to understand – Variables in an experiment.
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Design an experiment to test the following hypothesis
“The use of stimulants to boost memory for the short term does not help with long term retention . ”
Tell me what your variables are and how would you test this?
Independent variable – what are you going to manipulate in the experiment?
Dependent variable – what are you going to measure to see if the manipulation worked?
Subjects – who should do this experiment to make it the most successful?
All experiments must have some sort of criteria on which they are making a comparison – groups or conditions or drugs or really anything BETWEEN individuals or times. Something that you are sure that you are changing.
This criteria is called an Independent Variable – this is what you are manipulating in your experiment to determine if the criteria changes a behavior..
Psychology ALWAYS uses some Behavioral measure as the DEPENDENT VARIABLE – which is the method of understanding the EFFECT of the criteria from independent variable.
All experiments must have at least one SUBJECT (ideal is 15 subjects per group) – this is the person (people) who were are measuring to see how the criteria changes their behavior (more subjects mean more accurate results for most psychology research).
There are always extra variables in our experiment called Confounding Variables which can cause change in the dependent variable that we did not think of. This is the key to a good experiment is CONTROL of as may of these as we can to determine the effect of the Independent Variable on the Dependent variable.

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