TAMU CSCE 312 - TOPIC 1 (39 pages)

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TOPIC 1



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TOPIC 1

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Pages:
39
School:
Texas A&M University
Course:
Csce 312 - Computer Organization

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Department of Statistics TEXAS A M UNIVERSITY STAT 211 Instructor Keith Hatfield 1 Topic 1 Data collection and summarization Populations and samples Frequency distributions Histograms Mean median variance and standard deviation Quartiles interquartile range Boxplots What is Statistics What do you think of when you hear the word statistics sports boring not applicable to my field of study Statistics is the science of collecting classifying and interpreting data learning 3 Where will Statistics be used Everyday life for example Proper application of general probabilities How election results are presented Commercial claims clinical trials vs outliers Applications in the workplace Google web searches Netflix user recommendations Pharmaceutical drug development Sports analytics Modeling global climate change Credit card fraud detection Biomarkers and disease detection Criminal justice Many many more 4 Regardless of the field that you pursue you ve got to know statistics Deepak Kumar LinkedIn Principal Data Scientist Statistical thinking will one day be as necessary for efficient citizenship as the ability to read and write H G Wells author of War of the Worlds The best thing about being a statistician is that you get to play in everyone s backyard John Tukey Statistician I keep saying that the sexy job in the next 10 years will be statisticians and I m not kidding Hal Varian Google Chief Economist 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 Experimental study Deliberately impose treatments on groups in order to observe responses The purpose is to study whether the treatments cause a change in the responses 6 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 concept that describes the population Statistic A number produced from a sample that 7 estimates a population parameter Horry County SC Murder Case Do juries properly represent the racial makeup of Horry County which is 13 African American What is the population parameter of interest What sample statistic could be used to estimate the parameter and does the sample support the claim 295 jurors summoned 22 were African American 8 Experiment Terms Experimental Group A collection of experimental units subjected to a difference in treatment imposed by the experimenter 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 confounding effects 9 What are confounding effects When you have multiple factors in a study and you can t tell which factor causes a change in the variable of interest Example Does going to church



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