Stats- Chapter 1

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Author:
AmyHulin
ID:
193825
Filename:
Stats- Chapter 1
Updated:
2013-01-19 19:47:27
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Statistics
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Description:
Chapter 1- Data Collection
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  1. science of collecting, organizing, summarizing, and analyzing info to draw conclusions or answer questions. (sports stats, education stats, business, medicine, politics)
    statistics
  2. info collected from individual
    data
  3. entire group of individuals studied
    population
  4. person/object being studied
    individual
  5. subset of population selected to be studied
    sample
  6. organizing/summarizing data by tables/graphs
    descriptive stats
  7. use methods from sample, extend to population, measure reliability and answer questions
    inferential stats
  8. numerical summary of population
    parameter
  9. summary value based on a sample of individuals
    statistic
  10. characteristic of individuals of interest
    variables
  11. categorical, label, attribute, characteristic (ex: what's student major? gender? occupation? eye color? age categories? race?)
    qualitative data
  12. numerical, arithmetic operations used (ex: age? # of textbooks, # of credits, length of time for activity, batting avg, temp, weight, length)
    quantitative data
  13. based on a count (ex: # of people, # of credits, # of shoes)
    discrete data
  14. measurement not countable (ex: weight, miles driven, Qual=SS#, zip code, phone number)
    continuous data
  15. name only, no natural order (qual) (ex: major, political affiliation, gender, race, color)
    nominal level of measurement
  16. have order (qual) (ex: age categories, education level)
    ordinal level of measurement
  17. difference between 2 values is meaningful (ex: no absolute zero, temp, clock time, calendar years)
    interval level of measurement
  18. ratios of values have meaning, absolute zero (ex: length of time 60 sec->15 sec=1/4, # of textbooks, # of credits, physical length)
    ratio level of measurement
  19. amount of medicine, level of medicine in capsule
    explanatory variable
  20. amount of time person takes to have relief
    response variable
  21. no influence in explanatory or response variable
    observational study
  22. intentional change in explanatory or response variable
    experiment
  23. two or more explanatory variables are not seperated
    confounding
  24. explanatory variable not considered in study
    lurking variable
  25. look back in time, at past records
    retrospective
  26. data collected over time
    prospective

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