What is a  variable ?
Qualitative vs. Quantitative Variables
Examples of types of data Quantitative Continuous Discrete Blood pressure, height, weight, age Number of children, Number ...
 
 
 
 
Click of a button
Click of a button
Click of a button
 
 
 
 
 
 
 
Stem-and-leaf plots
Histogram
Box-and-Whisker plot
Box-and-Whisker plot
Scatter Diagram
Scatter Diagram
 
Correlation coefficient
Correlation coefficient
 
Correlation coefficient v/s Regression analysis
 
Measures of Central Tendency It is calculated as  follows.
Mean (Arithmetic Mean) or Average
 
Median .
 
Mode
Measures of Relative Position (Quantiles)
Answer
Measures of Variability
Measures of Variability
Range
Interquartile Range
Standard Deviation
<ul><li>measures variability in relation to the mean (or average) and is used to compare the relative dispersion in one ty...
 
 
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Graphical presentation of data

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Graphical presentation of data

  1. 2. What is a variable ?
  2. 3. Qualitative vs. Quantitative Variables
  3. 4. Examples of types of data Quantitative Continuous Discrete Blood pressure, height, weight, age Number of children, Number of attacks of asthma per week Categorical Ordinal (Ordered categories) Nominal (Unordered categories) Grade of breast cancer Better, same, worse Disagree, neutral, agree Sex (male/female) Alive or dead Blood group O, A, B, AB
  4. 9. Click of a button
  5. 10. Click of a button
  6. 11. Click of a button
  7. 19. Stem-and-leaf plots
  8. 20. Histogram
  9. 21. Box-and-Whisker plot
  10. 22. Box-and-Whisker plot
  11. 23. Scatter Diagram
  12. 24. Scatter Diagram
  13. 26. Correlation coefficient
  14. 27. Correlation coefficient
  15. 29. Correlation coefficient v/s Regression analysis
  16. 31. Measures of Central Tendency It is calculated as follows.
  17. 32. Mean (Arithmetic Mean) or Average
  18. 34. Median .
  19. 36. Mode
  20. 37. Measures of Relative Position (Quantiles)
  21. 38. Answer
  22. 39. Measures of Variability
  23. 40. Measures of Variability
  24. 41. Range
  25. 42. Interquartile Range
  26. 43. Standard Deviation
  27. 44. <ul><li>measures variability in relation to the mean (or average) and is used to compare the relative dispersion in one type of data with the relative dispersion in another type of data. </li></ul><ul><li>The data to be compared may be in the same units, in different units, with the same mean, or with different means. </li></ul>Coefficient of Variation

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