4 + +---+ | | | 3 + +---+ | | | | | 2 + | | | | | | | 1 + | | +---+ | | | | | 0 + +---+---+---+ 0 10 20 30
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 *.
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.
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.
The NBS-10 Dataset consists of 100 weighings of a 10 gram prototype weight by NBS.
This 10 gram prototype weight was obtained by NBS in 1940.
It has been weighed once a week since then as a quality check on its weighing equipment and procedures.
The following article discusses the problem of investigating unknown measurement error with prototype weights:
Find the outliers using the boxplot.
Delete the outliers (see Part F of the SPSS Tutorial).
Construct a histogram of the NBS-10 dataset with a superimposed normal curve.
The spread is the distance between the center and one of its inflection points.
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 |
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