Parts of an Experiment  Population – the type of people that you want to study.  Example: Americans, teenagers, people who pick their noses  Sample.

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Presentation transcript:

Parts of an Experiment  Population – the type of people that you want to study.  Example: Americans, teenagers, people who pick their noses  Sample – the people you actually use in the experiment.  Generally, the bigger the sample, the “ truer ” your results

Types of Samples  M and M experiment  Stratified sample – you pick the characteristics that you want.(better with smaller samples)  Random sample – you get what you get and you don ’ t get upset.(need to be larger)  How to get a random sample?

You got the people, now what?  Put them into groups:  Experimental group – they are the ones that you are going to “ do ” something to.  Control group – the are the ones who we compare the experiment group to.  Placebo group – fake out.

Variable AA variable is a thing IIndependent variable – it is what “ I ” as the experimenter do to the experimental group DDependent variable – it is what the independent variable does to the person/animal PPlacebo – sugar pill to determine if the independent variable actually does it or we just think it does.