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Statistics - PowerPoint PPT Presentation


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Statistics. …a science a way of finding things out. Statistical Data. Found almost anywhere Exists in a variety of forms Assists us in making informed decisions when faced with uncertainty and without bias. Definition. Collection Organization Analysis

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Presentation Transcript
statistics

Statistics

…a science

a way of finding things out

statistical data
Statistical Data
  • Found almost anywhere
  • Exists in a variety of forms
  • Assists us in making informed decisions when faced with uncertainty and without bias
definition
Definition
  • Collection
  • Organization
  • Analysis
  • Interpretation of numerical information
collect data
Collect Data
  • Samples
  • Experiments
  • Census
  • Simulations
organize
Organize
  • Frequency tables
  • Charts
  • Graphs
analyze
Analyze
  • Center/Shape/Spread/Outliers, Gaps
  • Trends…As x increases, y does something
  • Measures of central tendency
  • Measures of spread
  • Confidence Intervals
  • Hypothesis Tests
interpretation
Interpretation
  • Assumptions
  • P-value and Alpha level
  • Confidence level
  • Z score
  • T score
  • Written summary
caution
Caution
  • Can lie with our interpretation of statistics
  • Work diligently to use statistics to show the entire picture and the truth…by good intentions and by skill (non-ignorance)
population
Population
  • All measurements of interest…entire group of those being measured
  • Data from all…
sample
Sample
  • Part of the population
  • Smaller section of those being measured
  • Data from…
  • Random, representative sampling
random samples
Random Samples
  • Uh, yeah…NO!
  • Ages of students in Math 102 at Pepp
  • Ages of students on volleyball team
  • Ages of students in Stewart hall dorms
  • Ages of humans passing by Rockwell Academic Center
  • Yesss!
  • Random # Table w complete listing of st #s
  • Calculator with complete list of sts
  • Computer selects 30 from an alphabetical list