1 / 46

Business Statistics BUSA 3101 Dr. Lari H. Arjomand lariarjomandclayton

Chapters 2

sawyer
Télécharger la présentation

Business Statistics BUSA 3101 Dr. Lari H. Arjomand lariarjomandclayton

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

    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 classesyou 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

More Related