Ch1_Introduction to Statistics

Ch1_Introduction to Statistics - Introduction to statistics...

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Introduction to statistics
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Statistics is the language of the science  method Used to design, conduct, and analyze  scientific research  
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Variable variable  is any environmental condition, event, personal characteristic, or behavior that can take on  different values . =
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Independent Variables Independent variables  (IV) are manipulated  by the experimenter to determine their effect  on the dependent variable. Independent variables can be quantitative or  qualitative . HINT: This is the cause.
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Dependent Variables Dependent variables  (DV) are not under the  experimenter’s control. Dependent variables depend on the  independent variable. Dependent variables are usually quantitative. HINT: This is the effect.
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History Quetelet  (1796-1874) was  a Belgian professor who is  regarded as the father of  social sciences. He was the first person to  identify regularities to  describe an “average”  person. I am the father of social  sciences.
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Data Data  are scores or measurements that are  collected from observation of people or  animals. Example :  Age of students in a class: 19 24 20 22 21 33
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Statistics  are  methods  used to summarize,  analyze, and make sense out of collected  data. A statistic  is  a single number  used to  describe a set of data from the sample. QUESTION: Can you tell the difference?
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This note was uploaded on 11/30/2009 for the course HP 400m at USC.

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Ch1_Introduction to Statistics - Introduction to statistics...

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