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Green / Blue Sheets

Green / Blue Sheets. Data set : Big stack Elements : Each Person Variable : Each Question Observation : Each Sheet. Qualitative vs Quantitative Variables. Qualitative Quantitative. Nominal Ordinal Interval Ratio. Nominal. Ordinal. Interval . Ratio.

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Green / Blue Sheets

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  1. Green/Blue Sheets Data set: Big stack Elements: Each Person Variable: Each Question Observation: Each Sheet

  2. Qualitative vsQuantitative Variables

  3. Qualitative Quantitative Nominal Ordinal Interval Ratio

  4. Nominal

  5. Ordinal

  6. Interval

  7. Ratio

  8. Qualitative or Quantitative? • Nominal, Ordinal, Interval or Ratio? • Your smoking status • Your SAT score • How many votes Obama received in last election • Ounces of beef in your hamburger • Favorite color • Number of red M&M’s you have in your bag • Type of M&M’s with the most red ones

  9. Cross Sectional data Time Series Data

  10. Time series or Cross Sectional? Example 13.7 Current GPA of all students vs. Your GPA for each semester you’ve been at Purdue TA eval scores of all classes taught vs. Eval scores of all TAs from the last exam Salary of LA Lakers throughout 1990’s vs Salaries of all NBA teams in 1994

  11. Sample Population

  12. Statistical Inference

  13. Voter registration records show that 68% of all voters in Indianapolis are registered as Republicans. To test a random digit dialing device, you use the device to call 150 randomly chosen residential telephones in Indianapolis. Of the registered voters contacted, 73% are registered Republicans.

  14. How To Sample?

  15. Voluntary Response

  16. Convenience Sample

  17. Non-Random Sample NOT Hard NOT Random NOT The best Random Sample IS Harder IS Random IS The best

  18. Types Of Random Samples

  19. Simple Random Sample

  20. Stratified Random Sample Stratified Random Sample

  21. Cluster Sample

  22. Systematic Sampling

  23. Bias

  24. Variability

  25. Bias Low High Variability High Low

  26. Reduce Bias Random Sampling Reduce Variation Larger Sample

  27. Biased Questions

  28. Do you always wash your hands after Using a public restroom?

  29. What color shirt were you wearing March 23rd 2008?

  30. 520 baby seals are killed every year due to excessive drilling in Alaska, Would you vote ‘No’ to excessive drilling And help save these adorable seals?

  31. Survey

  32. Question 1: Buying a ticket if:

  33. Question 2: Is this surprising?

  34. Question 3: Which Plan Would You Choose?

  35. Graphing Qualitative Variables

  36. Data Tables

  37. In a poll of 200 parents of children ages 6 to 12, respondents were asked to name the most disgusting things ever found in their children’s rooms. The results are below (J&C 2005)

  38. Bar Graph Pie Chart

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