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Statistics

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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Statistics

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  1. Statistics …a science a way of finding things out

  2. Statistical Data • Found almost anywhere • Exists in a variety of forms • Assists us in making informed decisions when faced with uncertainty and without bias

  3. Definition • Collection • Organization • Analysis • Interpretation of numerical information

  4. Collect Data • Samples • Experiments • Census • Simulations

  5. Organize • Frequency tables • Charts • Graphs

  6. Analyze • Center/Shape/Spread/Outliers, Gaps • Trends…As x increases, y does something • Measures of central tendency • Measures of spread • Confidence Intervals • Hypothesis Tests

  7. Interpretation • Assumptions • P-value and Alpha level • Confidence level • Z score • T score • Written summary

  8. 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)

  9. Population • All measurements of interest…entire group of those being measured • Data from all…

  10. Sample • Part of the population • Smaller section of those being measured • Data from… • Random, representative sampling

  11. 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

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