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LSP 121 -- 9/16/10

 

Review Questions

  1. Draw the histogram for this dataset, where the bins are [0,10), [10,20), [20,30]:


    Ans: The number of observations in the bins [0,10), [10,20), and {20,30] are 3, 4, and 1, respectively. Here is the histogram:
    
     4 +      +---+
       |      |   |
     3 +  +---+   |
       |  |   |   |
     2 +  |   |   |
       |  |   |   |
     1 +  |   |   +---+
       |  |   |   |   |
     0 +  +---+---+---+
          0  10  20  30
    
  2. What information does the boxplot give you?

    Ans: It tells you Q0, Q1, Q2, Q3, Q4, and the locations of the outliers. Mild outliers are marked with o, extreme outliers are marked with *.

  3. What are the inner and outer fences for a boxplot?

    Ans: The inner fences are located at Q1 - 1.5 * IQR and Q3 + 1.5 * IQR. The outer fences are located at Q1 - 3.0 * IQR and Q3 + 3.0 * IQR. Note that * means multiplication.

  4. How do you export SPSS output to a Word document?

    Ans: On the SPSS Output Window, select File >> Export. Choose the filetype .doc and change the name of the output file to your choice for filename. Then edit the document and save it as a .docx file.

 

Projects 2a and 2b

 

Bell-shaped Histograms

 

The Standard Deviation (SD)

  It is difficult to understand why statisticians commonly limit their enquiries to averages and do not revel in more comprehensive views. Their souls seem as dull to the charm of variety as the of the native of one of our English countries, whose retrospect of Switzerland was that, if its mountains could be thrown into its lakes, two nuisances would be gotten rid of at once.
  Sir Francis Galton, 1822-1911

 

z-scores

Activity 3

 

Homework 1