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File999.Hatfield.Topic 1

File999.Hatfield.Topic 1 - Department of Statistics TEXAS...

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1 Department of Statistics TEXAS A&M UNIVERSITY STAT 211 Instructor: Keith Hatfield
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2 Register for the online materials Go to  http://dl 3 .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:  DS-475
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3 Topic 1: Data collection and summarization Populations and samples - pages  6 - 8   Frequency distributions - pages  16 – 19 Histograms - pages  20 - 22   Mean, median, variance and standard deviation - pages  28 - 32   Quartiles, interquartile range - pages  33 – 35 Boxplots - pages  35 - 37  
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4 What is Statistics? What do you think of when you hear the word  “statistics”?  (sports, boring, not applicable to my field of study) Statistics: The science of collecting, classifying, and  interpreting data. Anticipated learning outcomes: – appreciate and apply basic statistical methods  in an  everyday life setting  (Election polls, clinical trials, lies, big lies & statistics) – appreciate and apply basic statistical methods  in  their scientific field
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5 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.  (Sports  stats like John Madden, USA Today reports & the vast majority of other statistical applications in  business) 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.   (Polio Vaccine, Lyposene, General ANOVA concepts)
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6 Observational Study Terms Population:  The entire group of interest   (normally identified by those  running the study, like college student info, strength of concrete production, public percentages or acid  rain data). Sample:  A part of the population selected to draw  conclusions about the entire population  (must be cost effective, but  large enough to provide statistically valid results) Census:  A sample that attempts to include the entire  population  (generally not done > too costly) Parameter:  A concept that describes the population  (mean,  median, std. dev, variance, something described in words) Statistic:  A number produced from a sample that  estimates a population parameter  (a numerical value for a selected parameter,  developed from our sample data)
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7 Horry County SC, Murder Case Do juries properly represent the racial makeup of Horry  County which is 13% African American?
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