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Business Statistics BUSA 3101 Dr. Lari H. Arjomand lariarjomandclayton

Chapters 2

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Business Statistics BUSA 3101 Dr. Lari H. Arjomand lariarjomandclayton

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    2. Chapters 2 & 3 (Part A) Descriptive Statistics: Tabular and Graphical Presentations Summarizing Qualitative Data Summarizing Quantitative Data

    3. Summarizing Qualitative Data Frequency Distribution Relative Frequency Distribution Percent Frequency Distribution Bar Graph Pie Chart

    4. Construction of a Frequency Distribution

    6. Example: Marada Inn Guests staying at Marada Inn were asked to rate the quality of their accommodations as being excellent, above average, average, below average, or poor. The ratings provided by a sample of 20 guests are:

    9. Percent Frequency Distribution

    11. Bar Graph

    13. Pie Chart

    16. Summarizing Quantitative Data Frequency Distribution Relative Frequency and Percent Frequency Distributions Dot Plot Histogram Cumulative Distributions Ogive

    17. 1- Determine range 2- Select number of classes Usually between 5 and 20 inclusive 3- Compute class intervals (width) 4- Determine class boundaries (limits) 5- Compute class midpoints 6- Count observations & assign to classes Frequency Distribution Table Steps

    18. Example: Hudson Auto Repair

    20. Frequency Distribution Guidelines for Selecting Number of Classes

    21. Frequency Distribution (Continued) Guidelines for Selecting Width of Classes

    22. Example: Frequency Distribution For Hudson Auto Repair, if we choose six classes:

    23. Solution Using SWStat+ After putting your data into Excel, then create Data Area:

    24. SwStat Statistics Tabulations and Histograms Note that here we are using 10 classes—you can use 6 classes if you would like to do so. Solution Using SWStat (cont.)

    25. Results: Solution Using SWStat (cont.)

    26. Relative Frequency and Percent Frequency Distributions

    28. Dot Plot One of the simplest graphical summaries of data is a dot plot. A horizontal axis shows the range of data values. Then each data value is represented by a dot placed above the axis.

    29. Dot Plot

    30. Histogram

    31. Histogram

    32. Symmetric Left tail is the mirror image of the right tail Example: heights and weights of people Histogram (Continued)

    33. Moderately Skewed Left A longer tail to the left Example: exam scores Histogram (Continued)

    34. Moderately Right Skewed A Longer tail to the right Example: housing values Histogram (Continued)

    35. Highly Skewed Right A very long tail to the right Example: executive salaries Histogram (Continued)

    37. Cumulative Distributions Example: Hudson Auto Repair

    41. Frequency Distribution Table Another Example

    42. Frequency Distribution Table Example (Continued)

    45. Relative Frequency & % Distribution Tables Example (Continued) The number of classes is usually between 5 and 15. Only 3 are used here for illustration purposes.The number of classes is usually between 5 and 15. Only 3 are used here for illustration purposes.

    46. Cumulative Percentage Distribution Table Example (Continued) The number of classes is usually between 5 and 15. Only 3 are used here for illustration purposes.The number of classes is usually between 5 and 15. Only 3 are used here for illustration purposes.

    47. End of Chapters 2 & 3, Part A

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