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Chapter01

# Chapter01 - Department of Statistics TEXAS A&M UNIVERSITY...

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Department of Statistics STAT 211    Principles of Statistics I Instructor:   Erning Li

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Register for the online materials Go to  http://dl.stat.tamu.edu/dostat/ Click on  Register here Specify account info and click  Submit Click on  log in   Enter your account info and click on  Log in!   Click on  Add course Enter the following information – Course reference:  – Registration code:
What is Statistics? What do you think of when you hear the word  “statistics”? Statistics: The science of collecting, classifying, and  interpreting data. Anticipated learning outcomes: – appreciate and apply basic statistical methods  in an  everyday life setting – appreciate and apply basic statistical methods  in  their scientific field

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Collecting data Observational study : Observe a group and measure  quantities of interest.  This is passive data collection in  that one does not attempt to influence the group.  The  purpose of the study is to describe the group.  Experiment:  Deliberately impose treatments on  groups in order to observe responses.  The purpose is  to study whether the treatments cause a change in the  responses.
Observational Study Terms Population:  The entire group of interest Sample:  A part of the population selected to draw  conclusions about the entire population  Census:  A sample that attempts to include the entire  population Parameter:  A fixed  unknown  number that describes the  population Statistic:  A number produced from a sample that  estimates a population parameter

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Horry County SC Murder Case Do juries properly represent the racial makeup of Horry  County which is 13% African American? 295 jurors summoned, 22 were African American What is the population parameter of interest? What sample statistic could be used to estimate the  parameter?
Experimental Group:  A collection of experimental  units subjected to a real treatment. Control Group:  A collection of experimental units  subjected to the same conditions as those in an  experimental group except that no treatment is  imposed. This design helps control for potential

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Chapter01 - Department of Statistics TEXAS A&M UNIVERSITY...

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